bids are invited for custom bid for services - part-a: services for providing electrical maintenance assistance at gail colonies and guest house , custom bid for services - part-b: item rate services & services on need basis operation and maintenance of electro-mechanical installations operation and maintenance of electro-mechanical installations annual maintenance contract for networking devices (version 2) annual maintenance contract service -laser speed meter customized amc/cmc for pre-owned products annual maintenance service-air conditioner annual maintenance service for centralised air conditioning system annual maintenance service - desktops, laptops and peripherals annual maintenance service for aadhar enrollment kit comprehensive annual maintenance services for precision air conditioners annual maintenance services for video conferencing system (software based) annual maintenance services for water purification and conditioning system (version 2 total quantity :