Tender For corrigendum : upgradation of electrical works for various gpra flats/quarters under service centre 201,202,203, sd-1/ded-11, cpwd, new delhi. (sh: providing video door phone with image display system at tilak lane, bapa nagar and kaka nagar)subwork/packages:providing video door phone with image display system at tilak lane, bapa nagar and kaka nagar.