metallised carbon strips for pantographs as per rdso specification no rdso 2009 el spec 00 97 rev 1 sep 2013 and conforming rdso drg no skel 4303 rev 6 grades approved by rdso lko 1 m s acpl grade my 7d 2 m s carbone loraine merson india grade p 5696 3 m s schunk grade bh 42 4 c1 note clw approved sources shall only participate in the tender warranty period 30 months after the d ate of delivery