Gem Bids For Custom Bid For Services - Support In Day To Day Calibrationof Instruments In Instrumentation Lab, Maintenance Ofmachines In All Blocks Bl-1, 2, 3, 4, 5, 6, 8, 12, 14, 15 And Turbogenerator Tg / Exciter Testing Activities In Block-1 Of Heep, Bhel, Harid..