ZR. CU PUNCHING TYPE RESISTANCE RING MECHANICALLY INTERLOCKED TO END PL ATE FOR SCHEME- II ROTOR. DRG. NO: SKEL 4742 ALT. 1. SPECN. NO: RDSO/ 2008/ EL/ SPEC/ 0064/ REV- 3, STR NO. CLW/ TM/ 17730 REV- 1. [ Warranty Period: 30 Months after the date of delivery ].