supply of aar h tyepe tight lock coupler head assembly as per sanrok drawing no.1ed-1013 and conforming to rdso specification no. rdso/2011/cg-03 rev-1 make- sanrok (note material need to e supplied in assembled condition as per drawing).aar h tyepe tight lock coupler head assembly as per sanrok drawing no.1ed-1013 and conforming to rdso specification no. rdso/2011/cg-03 rev-1 make- sanrok (note material need to e supplied in assembled condition as per drawing).,aar h tyepe tight lock coupler head assembly as per sanrok drawing no.1ed-101 3 and conforming to rdso specification no. rdso/2011/cg-03 rev-1 make- sanrok (note materi al need to e supplied in assembled condition as per drawing). [ warranty period: 48 months aft er the date of delivery ] ]