supply of main spring assembly for pantograph type am-12 to contransys part no.c.0600 or to equivalent part no. of gsec or concept rail engineers confirming to rdso20080066 rev.0 dated 20.06.2008 and amend 1. or latest if any. note: clw approved sources shall only participate in the tender or supplier offers shall be considered with valid tender specific authorisation certificate from clw source shall be submitted along with their offer.main spring assembly for pantograph type am-12 to contransys part no.c.0600 or to equivalent part no. of gsec or concept rail engineers confirming to rdso20080066 rev.0 dated 20.06.2008 and amend 1. or latest if any. note: clw approved sources shall only participate in the tender or supplier offers shall be considered with valid tender specific authorisation certificate from clw source shall be submitted along with their offer.,main spring assembly for pantograph type am-12 to contransys part no.c.0600 or to equival ent part no. of gsec or concept rail engineers confirming to rdso20080066 rev.0 dated 20.06.2008 an d amend 1. or latest if any. note: clw approved sources shall only participate in the tender or supplier off ers shall be considered with valid tender specific authorisation certificate from clw source shall be submit ted along with their offer. [ warranty period: 30 months after the date of delivery ] ]