Latest oxygen test kit Tenders | Government oxygen test kit Tenders

Central Government / Public Sector

CTN :38339492

27 Mar, 2025 139.30 Crore

Bangalore - Karnataka

Tender For corrigendum : design, supply, installation, commissioning, training of various type of equipments for esdm (electronic system design and manufacturing) of msme training centers located at greater noida, bengaluru, puducherry and idemi mumbai on turnkey basis - decade resistance box , ct/pt calibration system , multifunction calibrator , decade capacitance box , ct analyzer , standard resistors , standard weights (el class) , pippete calibration system , low temperature bath (-80 to ambient degree temperature) , frequency counter , energy meter test system (3 position) , precision temperature stabilised resistance standard (high) , decade inductor box , precision temperature stabilised resistance standard (low) , sound level calibrator , digital power analyser , decade resistance box (4 nos.) , process calibrator , hv divider , decade mega ohm box , standard weights (e2 class) , 6 and half dmm , temperature indicator , time interval meter , temperature indicator with compensation , standard weights (f1 class) , semi-micro balance (upto 200 gms) , tachometer calibrator , standard thermocouple (type s) without compensation , sound level analyzer , standard platinum resistance temperature (prt) detector , precision balance (upto 6.1 kg) , thermo-couple calibartion furnace (300 to 1100 degree temperature) , lcr bridge , humidity measurement probe , dry block calibrator (ambient to 600 degree temperature) , anechoic chamber with radiated susceptbility and radiated emission test system , alltitude test chamber , compact emc tester , environmental chamber , digital pressure controller (dead weight pressure tester) , line impedance stablizing network , harmonics/flicker measurement test system , impulse generator , rf shielded chamber , vibration plus environmental chamber , three phase regulated variable power source , humidity generator, relative humidity , bump/shock test system , heat deflection temperature test set , vibration test system , electronic load , conducted rf immunity simulator , rohs testing lab - inductively coupled plasma optical emission spectrometer (icp-oes) , thermal shock chamber , ac dc current source , ultra precision capacitance bridge , esd simulator , horizontaland verticlal flame chamber , rohs testing lab - energy dispersive x-ray fluorescence spectrometer (edxrf) , single phase regulated variable power source , precision energy standard , rohs testing lab - gas chromatograph mass spectrometer (gc-ms) , ingress of water test system - i set , rohs testing lab - ion- chromatograph (ic) , needle flametest chamber , salt spray chamber , dust chamber , digital storage oscilloscope , defibrillator proof test set , thermostat endurance test set , flexing test apparatus , electrical safety tester , winding resistance meter , temperature recorder , radiation meter , tracking test apparatus , gas detector , cord anchorage test set , digital multimeter (handheld/desktop) , glow wire test apparatus

Central Government And Public Sector

CTN :37768769

24 Mar, 2025 85.43 Lacs

Dharchula - Uttarakhand

Tender For bid to ras tender for supply of radar type water level sensor (awlr) - (0 - 30) meter range with all accessories complete and as per tech specs. , radar type velocity sensor with all accessories and as per tech specs. (annex-ii) , data logger for awlr/ velocity sensor with all accessories including frp enclosure and lightning arrestor and as per tech spec. (annex-ii) , gsm/gprs/3g/4g/5g single sim modem to transmit data over internet from data logger to api server and as per tech specs. (annex-ii) , power supply - i) smf battery bank , battery stand , frp enclosure and other required accessories having minimum backup up to 15 sunless days for both sensors/data logger and vsat , solar panel , solar charge controller/charger for charging above battery bank and ups/ inverter for regular feed of ac power for the above system. , providing earthing of local station consisting of 1 no. lighting arrester and 02 nos. electronic earthing. , v-sat trans-receiver and all other accessories supporting minimum band width of 256 kbps bandwidth with interfacing facility with the data logger as per specs (annex-ii) and subscription for bandwidth. , supply of siren with accessories complete in all respect viz. power supply provision , mounting , provision of integration with awlr etc , web portal dashboard for viewing current/ historical data of the sensors , installation , commissioning , testing of entire system and trial run of the system including api & vsat data connectivity. , amc charges for the installed system after warranty period

State Government

CTN :39679714

29 Mar, 2025 NA

Dehradune - Uttarakhand

Tender For corrigendum : supply of tools and equipments - allen key set , calliper inside spring , caliper outside spring , dividers spring , electrician screw driver , hammer ball peen , handls file for second cut , philips screw driver set of 5 , pliers combination , spanner de set of 12pcs , spanner socket , steel rule , chisel flat , wire cutter and stripper , adjustable spanner , drill twist , electric soldering iron , enginees square , feeler gauge , file flat bastard 200mm , file half round 2nd cut 200mm , file square 2nd cut 200mm , file square round 300mm , file trainsgular 2nd cut 150mm , flat file 2nd cut 250mm , flat file bastrad350mm , drift punch copper , hacksaw frame , hammer chipping , hammer copper with handle , hammer mallet , insulated screw driver , magneto spanner set , piston ring groove cleaner , pliers flat nose , pliers round nose , pliers side cutting , punch letter 4mm , scraper traingular , spanner t flocks , spanner adjustable , spark plug spanner , stud remover , torque wrench , vaccum gauge , valve spring compressor , vernier caliper , steel measuring tape , auto electrical test bench , battery charger , car jet washer , blow lamp , belt tensioner gauge , chain pulley block , compression testing gauge , cylinder liner , different engine bearing model , diffrent piston model , fuel feed pump , enginees sthethoscope , grease gun heavy duty , lifting jack screw , multimeter digital , automotive oil pump , radiator cut section cross flow , radiator cut section down flow , radiator pressure cap , surface gauge with dial , tachometer , tandem master cylinder , thermostat , timing lighter , turbocharger cut section , automotive water pump , work bench , working model air brake assembly , alternator assembly , cut section transmission gear box , cut section centrifugal clutch , demonstration board of electronic ignition system , demonstration board of mpfi system , disc brake in working condition , drum brake assembly , functional model of diff sensor , steering assembly , tubeless tyre cars truck , tyre split rim wheel , working model of power windows , air conditioned crdi vehicle in running condition , automotive exhaust five gas analyser and diesel smoke meter , diesel engine crdi four stroke for dismantling , diesel engine running condition stationary type , hydraulic jack hi lift , multiscan tools to scan engine , working condition of diesel engine crdi four stroke fault simulation , cut secton of four bye six cylinder diesel engine , diesel engine six cylinder in running condition , four stroke petrol engine with cng setup , mpfi petrol engine with swiveling stand , petrol engine two stroke , tybe tyre vulcanizing machine , two post car lift cap 4000kg , wheel allignment machine , wheel balancing machine , working condition of petrol mpfi engine fault , carburetor solex mikuny , cut section model of electrical sysytem working model , heavy commericial vehicle , cylinder bore gauge capacity , mini drafter , set square , draughtsman drawing box

CTN :39342632

15 Apr, 2025 4.67 Crore

Amravati - Maharashtra

Tender For corrigendum : selection of system integrator for supply, establishment, operation and maintenance of center of excellence on digitalization through simulation at government college of engineering ,amravati - hardware part, battery charge and discharge test system, data acquisition and logging system, thermocouple/ rtd for temperature measurement, battery tester for internal resistance testing, electric vehicle bldc motor training system, bldc (brushless) inner rotor brushless dc motor coupled with dc shunt motor to study the load characteristics and study of drive parameters, battery characteristics training system, pmdc motor training system, power and transmission system study models for ev application, pmsm motor coupled with dc generator test bench setup, switched reluctance motor coupled with eddy current dynamometer test bench setup, pwm charge controller training system:, sectioned electric vehicle two-wheeler chassis, sectioned electric vehicle four-wheeler chassis, battery resistance spot welding machine, dc /ac clamp meter, non-contact type tacho meter, computing workstations for ev design and simulation, multi-body dynamics analysis research software bundle for ev (10 user), power train/ gearbox design research software package, 1d+3d thermal modelling, bms modelling, electric motor, ic engine modelling research software package, multi-physics cae research software package with battery modelling and analysis capabilities, nmc cell ( size 18650), nmc cell ( size 26650), lfp cell, smart bms training system, electric vehicle scanner, diy kits for 20 students, advanced driver assisting system (adas) training system for e-mobility, ac ev charger 10kw, dc fast charger: 20kw, multifunction installation tester, electric vehicle service equipment test adapter kit, battery tester with inbuilt printer, digital infrared thermometer, digital multifunction meter with vfd, ef-detection & 3-phase rotation, vde approved insulated tool set for ev, electric vehicle safety equipment, ev battery assembly & testing centre setup, ev battery pack cell equalizer, regenerative charging and braking training system, ev assembly disassembly kit, three phase power clamp-on meter with harmonics measurement, digital insulation multi function meter, phase sequence indicator, battery quality anaylyzer with data logger, laptop, hybrid display module, hybrid trainer module motorized, professional wall charts (approx 4 ft x 3 ft ), professional lab layout and design, computing workstations / pc, engineering simulation software multi-physics cae research software (includes pre-processor and post processor) 10 users, 3d cad package ( 60 user), laptops, professional wall charts (approx 4 ft x 3 ft ), professional lab layout and design, video conferencing set-up, electromagnetic (em) simulation with circuit design, rf circuits and system design (5g) academic research software :, integrated circuit (ic) design & verification academic research software :, soc development board with software, emc/emi test equipment, spectro radiometer for measurement of the luminous flux, spectrum, color, and color rendering indices of single leds (hand held device), high end computers, 3d printer for prototyping, laptop, professional wall charts (approx 4 ft x 3 ft ), professional lab layout and design, revolving chair with arm centre pivot mechanism, computer table, white board with stand, revolving office chair with arm centre pivot mechanism for faculty, laboratory wooden table, office table for faculty, major almirah with glass type doors, seminar chairs with desklet, executive office table, executive office chair, sofa set (3+2+1 seater), teapoy/coffee table, visitors chairs with cushion, major almirah, multi function/ all in one printer for office and lab, necessary electrification and networking, matting area with labour work (in sq ft), false ceiling (in sq ft), window sliding door, window curtains with fitting, gypsum plaster with wall putty, wall colori

CTN :39708809

01 Apr, 2025 1.54 Crore

Mysore - Karnataka

Tender For package-3 supply, installation, commissioning, testing, training and maintenance of instrumentation of taraka dam in mysore district of karnataka state under drip-ii -world bank aided. - automatic water level recorder, weather station, uplift pressure measurement system, jelly filled cable, cable termination and switch box, spvc cable, laying of armoured jelly filled cable, providing and installing of digital readout unit, providing and installing of data collection unit and transmission system server, settlement plate/survey markers, data collection unit and transmission equipment, providing and installing of electronic sirens, providing installation and commissioning of tilt meters, vibrating wire piezometer/pore pressure meter, drilling of 1 mts bore holes, pair armored jelly filled cable of standard, cable termination and switch box-2, laying of armoured jelly filled cable-2, pvc pipe, v noutch, slope stability analysis, masw test to estimate dynamic soil constant, installation charges, installation charges for drainage gallery instrumentation, total station, amc

CTN :39746812

24 Mar, 2025 70.00 Lacs

Imphal - Manipur

Tender For supply and installation of laboratory equipments for government and government aided colleges of manipur. - physics, digital function generator, dual channel variable dc regulated power supplies, op-amp (ic741), coupling coefficient of piezoelectric crystal expt. set, dielectric constant apparatus (with tunable frequency), 20 mhz dual channel oscilloscope (cro), four probe apparatus, malus law apparatus., dipole antenna, wolaston air film (asico), brewster s law expt setup, plancks constant using led , determination of wavelength of laser source using diffraction of single and double slit, magnetic susceptibility gouys balance method expt set, bh curve apparatus with solenoid, ultrasonic diffraction grating expt set, microwave optics system trainer kit, stefan boltzmann constant apparatus, fibre optic trainer kit for numerical aperture, plancks constant expt. , geology, rocksmins geological hammer, polarizing microscope , brunton compass, garmin gps etrex 10x, botany, portable autoclave, burette, 50ml, centrifuge machine (mini), digital microscope with inbuilt camera, digital balance, digital spectrophotometer (single beam), medical microscope, horizontal gel electrophoresis with power supply, garmin gps etrex 10x, hot air oven (digital), magnetic stirrer, micro centrifuge tubes 1.5ml, 500/box, rotary microtome, auto digital ph meter, volumetric pipette, class a, 5ml, soil and water testing kit, soxhlet extraction apparatus, silica thin-layer chromatography (tlc) plates, mini vertical unit, water bath, 6l, chromatographic chamber, column chromatography, with integral sintered disc (grade-1), colorimeter cuvettes glass, dessicator, with cover, neutral glass with porcelain plate, ganongs potometer, ganongs respiroscope, kjeldahl digestion unit with glass part, max and min thermometer, ninhydrin sprayer, pipette pump 10ml, porcelain crucibles, separating funnel with i/c polypropylene stopper, squibb shape, ptfe needle valve,(500 ml), thermometer mercury 360 deg c, digital anemometer cup type with counter, conductivity meter , dissolved oxygen meter, distillation unit , 4l/hr make:- supertek features:-, flask, conical (erlenmeyer) graduated, (100 ml), digital flame photometer (single channel), hygrometer (digital), laminar air flow (horizontal), muffle furnace, rain gauge, shaking incubator, 12l, soil thermometer, stopwatch, tissue grinder, bod incubator, hydrometer, vernier/slide calliper (digital), soil moisture meter, uv transilluminator, winkler bottles (bod), 300ml (2/pkt), zoology, rotary microtome (erma type), sahlis haemometer, haemocytometer, sphygmomanometer (dial type), stethoscope, centrifuge machine (fixed rpm), museum specimen balanoglossus, museum specimen- herdmania, museum specimen-branchiostoma, museum specimen-petromyzon, museum specimen-myxine, museum specimen-sphryna, museum specimen-pristis, museum specimen-torpedo, museum specimen-chimaera, museum specimen-exocoetus, museum specimen-heteropneustes, museum specimen-echeneis, museum specimen-anquilla, museum specimen-hippocampus, museum specimen-tetrodon, museum specimen-flat fish, museum specimen-ichthyophis, museum specimen-necturus, museum specimen-alytes, museum specimen-salamandra, museum specimen-chelone, museum specimen-trionyx, museum specimen-varanus, museum specimen-uromastix, museum specimen-chameleon, museum specimen-draco, paper chromatography, digital precision balance (600g, 0.01g), distillation unit, 4l/hr, calorimeter, museum specimen- limulus, museum specimen- peripatus, museum specimen-nautilus, model of ornithorhynchus, dissolved oxygen meter, hygrometer (digital), hydrometer, ph meter digital, soil moisture meter, thermometer 360 deg c, hot air oven (digital), centrifuge machine (mini), medical microscope, bod incubator, slide- sections of amphioxus through pharyngeal region, slide- sections of amphioxus through intestinal and caudal region, slide- sections of balanoglossus through proboscis, slide- sections of balanoglossus through branch

CTN :39741420

08 Apr, 2025 NA

Betul - Madhya Pradesh

Tender For supply installation and commissioning lab equipments , etc - package1, anemo meter, binocular dissecting microscope, binocular microscope, cod analyser, digital colony counter, digital tds meter, dslr camera, farmel s photometer, ganongs photometer, ganongs respirometer, microscopic camera, moll.s half leaf apparatus, ph meter, slide cabinet with 12 showcase, slide reader, mirowave oven, compound micrscope, dissecting microscope, research microscope with digital photography, micropipette 10, micropipette 20, micropipette 100 l, herbarium cabinet, water and soil testing kit, dna isolation kit, colorimeter, auxanometer, noise level meter, ph electrode, water bath double wall, tissue culture rack, dissolved oxygen meter, slide box 50 slides, dissection kit, osmotic pressure appratus, micro tips 10 l, micro tips 200 l, d.o. meter, digital conductivity meter, ph meter, digital balance, magnetic stirrer, digital colorimeter, melting point apparatus, digital potentiometer, water bath rectangular, polarimeter, refrigerator, reflux condenser, chemical storage rack, h2s gas keep apparatus, vacuum pump, melting point/boiling point apparatus, sprayer with rubber bulb, exhaust fan, desiccator, chromatography jar, mortar and pestle, gas lighter, stop watch, laminar air flow/ laminar hood, electrophoresis unit (horizontal) with power supply, autoclave, gel documentation system, centrifuge, colony counter, homogenizer, incubator (orbital shaking), ph meter (microprocessor based), bod incubator, cod analyser, tds meter, digital thermometer, flame photometer (photo diode sodium, potassium,, soil and water analysis kit, mili-q water purifier, micropipette10 l, micropipette 20 l, micropipette100 l, micropipette1000 l, turbidity meter, stethoscope, sphygmomanomet er, cold box, glucometer, anatomy structure model stomach part (human torso complete), anatomy structure model ent part, anatomy structure model digestive system, anatomy structure model genital and pelvis, colorimeter, pcr tube (tarsons individual pcr tube 0.5 milliliter), micro tip box 10-200 l, micro tip box 100-1000 l, micro tip box 1-20 l, micro tips 200 l, micro tips 1000 l, pcr tube 0.5 l, pcr tube 0.2 l, reagent bottle 100 ml autoclavable, reagent bottle 500 ml autoclavable, eppendorf 15 ml, inoculating loop, petridish 75 mm, falcon tube 15ml, falcon tube 50ml, dna-isolation kit, refrigerated micro-centrifuge, centrifuge tube, thermo-mixer, mortar and pestle, petri dish, dissection kit, nanodrop (biored), conductivity meter, research microscope with digital photography, ultra low temperature lab deep freezer (-80c), analytical balance, ultra centrifuge, deep freezer (-20 degree c) blue star 401-500 liters, refrigerator (4 degree c) double door, electrophoresis unit (vertical) with power supply, thermocycler semi-quantitative, conical flask 100 ml autoclavable, conical flask 500 ml autoclavable, conical flask 1000 ml autoclavable, beaker 50ml, cover slip 10 box, petridish 75mm, beaker 50ml, beaker 250 ml, conical flask 250ml,500ml, water cooler with purifier, rydberg s constant using hydrogen discharge tube, frank hertz experiment, fabry- parot etalon, millikan s oil drop method, pn-junction diode, zener diode, pnp/npn transister(ce and cb mode), jfet, electricalkettle with variable voltages, platinum resistance thermometer, electromotive force of a thermocouple, clement- desorme s method, thermal conductivity using calorimeter, mechanical equivalent using joule calorimeter, critical constant of a gas/vapour, poiseuille s method, maxwell s needle appratus, determination of moment of inertia, determination of force constant of a spring, lcr circuit, determination of poisson s ratio of rubber, lissajous figures with the help of cro, melde s experiment, i- curve byspectrometer, prism using sodium light, newton s ring (plano-convex), liquid using newton s ring, sodium light using plane defferaction grating, polarimeter, resolving power of a telescope, charging and discharging a condens

Central Government/Public Sector

CTN :39731237

08 Apr, 2025 51.94 Lacs

Kanchipuram - Tamil Nadu

Tender For sitc of cctv systems and biometric kote management system for cisf at chennai airport - 2 megapixel bullet camera , 24 port switch poe uplink with two fiber cable and cat 6a 1ghz , biometric fingerprint scanner secugen hamster pro 20 , computer with 19 inches or above screen 16gb ram 1tb hdd windows 11 professional with 5 years warranty and latest version antivirus and dual video card , ups 1 kva , cat 6a io box with faceplate , cat 6a cable 305 meters each box , pvc conduit pipes 2 inches , ip66 outdoor camera boxes , jack panel cat 6a fully loaded 24port , patch cable cat6a 1 meter , patch cable cat6a 5 meter , led industrial monitor 42 inches or above , camera application software with licenses perpetual , higher end server with 32 gb ram 2 tb ssd or hdd for os with 4 gb graphics card and storage of 24 tb hdd usable latest version server os , computer with 19inches or above screen 16gb ram 1tb hdd windows 11 professional with 5 years warranty latest version antivirus and dual video card , 24 u floor mounted rack with all accessories exhaust fan power manager and hangers etc , ups 5 kva , soft soil digging , installation testing, commissioning charges for the above boq items

CTN :39038232

29 Mar, 2025 13.18 Crore

Gandhinagar - Gujarat

Tender For corrigendum : supply of goods, tools & equipmentforan international standard itotin mechanic motor vehicle (mmv) tradeat iti tarsali, gujarat, india (package 3: mmv trade) - alternator assembly used for lmv working condition demonstration kit , starter motor assembly used for lmv working condition demonstration kit , electronic engine control module , fuel pump for mpfi working condition demonstration kit , inline fuel injection pump and rotor type fuel injection pump , demonstration board of 2wheeler ignition system. , demonstration board of electronic ignition system. , working condition of petrol mpfi engine assembly with fault simulation board , mpfi petrol engine with swiveling stand along with special tools for dismantling and assembling , demonstration board of mpfi system , ultrasonic injection cleaning equipment , working model of power windows , petrol engine motorcycle/scooter along with special tools and accessories , four stroke multi cylinder diesel engine in working condition , four stroke four cylinder crdi diesel engine in working condition , functional/experiment model of different type of sensors. , auto electrical test bench , cut section model of mock layout of a motor car -electrical system - working model , cut section working model of single plate clutch assembly. , cut section working model of diaphragm clutch assembly. , cut section working model of centrifugal clutch assembly. , front axle ( rezeppa joint) with stand for dismantling and assembly , rear axle with stand for dismantling and assembly , cut section model of synchronous gear box working , cut section model of sliding mesh gearbox working , cut section model of constant mesh gearbox working , full floating axle and semi- floating axle assembly , cut section working model of automatic transmission gear box , steering assembly - , 1. rack& pinion, , 2. worm& roller , 3. recirculating ball , 4. power steering , wheel alignment set up instrument-computerized , brake testing equipment (to test efficiency of vehicle where motion after braking is plotted) , motor vehicle in running condition (diesel heavy) with hydraulic power steering , light motor vehicle diesel crdi with electronic power steering and car a/c , engine dynamometer , four stroke multi cylinder engine mpfi petrol with cng kit set up in running condition , four cylinder four stroke diesel engine test rig with rope brake dynamometer , exhaust gas analyzer - diesel , training setup for adas systems , 4-wheel alignment set & hoist with advanced driver assistance systems (adas) complete frame targets , steel toolbox with lock and key (folding type) , punch letter , outside micrometer (0 25) , outside micrometer (25 50) , outside micrometer (50-75) , outside micrometer (75-100) , inside micrometer (25-50) , depth micrometer (0-25) , thread micrometer , adjustable micrometer sprit level to measure flatness, indication and taper with prismatic measuring base , vernier caliper , digital vernier caliper , vernier depth gauge , vernier bevel protractor, least count 5minutes , telescope gauge , dial test indicator plunger type (complete with clamping devices and stand) , universal surface gauge , cylinder bore gauge , compression testing gauge suitable for petrol engine. , vacuum gauge , granite surface plate , work bench , spanners socket with speed handle, t-bar, ratchet and universal , magneto spanner set , cylinder ridge cutter , vice grip pliers , torque wrenches , pneumatic tools set , car jet washer , pipe flaring tool , pipe cutting tool , universal puller for removing pulleys, bearings , stud extractor set of 3 , stud remover with socket handle , paraffin pressure gun , hand reamers adjustable , straight edge gauge , straight edge gauge , ladle , electric soldering iron , wire gauge (metric) , digital multi meter, 3 % digit (min), diode test mode and continuity mode, , growler , hydrometer , battery analyzer with printer , carburetor - solex, mikuni for dismantling a

CTN :38924587

25 Mar, 2025 12.74 Crore

Gandhinagar - Gujarat

Tender For corrigendum : supply of goods, tools & equipmentforan international standard itotin wireman tradeat iti kubernagar, gujarat, indiapackage 5: wireman trade - low voltage control and systems., residential and small business systems, electrical machine trainer, motor-generator (ac to dc), motor generator (dc to ac) set, linear i.c. trainer, digital i.c. trainer, grid connected industrial photovoltaic training system three phase system, component of typical small hydro power, component of typical water mill, off-grid photovoltaic training system with solar pump system single phase system, building control systems and automation, industrial control system and automation, 20 kv voltage distribution and grid control system, testing lab, ar-vr training set up., portable electric drill machine, pillar electric drill machine, outside micrometer, motorized bench grinder, rawl plug tool & bit, hydrometer, thermometer, soldering iron, copper bit soldering iron, de soldering gun, table vice, ohm meter; series type & shunt type, stock and dies conduit, multi meter (analog), digital multi meter, a.c. voltmeter, milli voltmeter, d.c. milliammeter, ammeter, a.c. ammeter, a.c. ammeter, kilo wattmeter, a.c. energy meter, power factor meter, frequency meter (analog + digital), tachometer with stopwatch, current transformer primary-, potential transformer, growler internal+ external, tong tester / clamp meter, megger, wheat stone bridge with galvanometer & battery 2 nos, earth tester

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