bids are invited for custom bid for services - cmc for audio visual system and other equipment annual maintenance service - audio conferencing system annual maintenance service - video conferencing system annual maintenance service - epabx copper and copper alloy rods and sections (other than forging stock) steel tubes, tubulars and other steel fittings as per is 1239 (part 2 - steel pipe fittings) lead sheets and strips for other than chemical purposes-is:405 (part 2) prelaminated particle boards from wood and other lignocellulosic material (v2) as per is 12823 steel tubes, tubulars and other wrought steel fittings (v2) as per is 1239 part 1 digital voice recording and replay system for airports (aai). electronic mail and messaging software covered electrodes for manual metal arc welding of stainless steel and other similar high alloy steel (v2) conforming to is 5206 wooden podium sinks / wash basins - vitreous china as per is 2556 (part 4 total quantity :