supply of zirconium copper stamping and modified zirconium copper stamping for shaft mounted copper stamping type resistance ring design of rotor for traction motor type 6fra-6068 for wag-9 / wap-7 locos., zr. cu. stamping type resistance ring for shaft mounted scheme- i rotor. drg. no: skel-4738 alt-3, ref.-2, spec. no: rdso / 2008 / el / spec. / 0062 / rev-3, str no: clw / tm / 17700, rev-1 [ warranty period: 30 months after the date of delivery ] , modified zirconium copper stamping for shaft mounted copper stamping type resistance ring design of rotor ( scheme-i ) for 3-phase tm type 6fra 6068. as per drg.no. 4738 alt-3 ref.1 specification no. rdso / 2008 / el / spec / 0062 rev-3, str no. clw / tm / 17700 rev-1 [ warranty period: 30 months after the date of delivery ]