Tender For maintenance of electrical installation & fans, repair maintenance of water pump sets, compound lights, sub-station, package/split/window type a.c. water purifier, cctv, access control system and lift etc. of eastern regional test laboratory (east) at dn-63, sector-v, salt lake city, kolkata91 during 2025-26 (sh: comprehensive maintenance of package & split/window type a.c.)subwork/packages:comprehensive maintenance of package & split/window type a.c.