supply of assembly of central coupler abc (new) for ksr as per drawing no. ep/dga-12m & nw/bda-8002/m. note: 1) material test certificate from nabl approved lab should be submitted along with the supply of material. 2) each unit should be embossed/engraved with makers, name, month, year and batch no of manufacturing at a conspicuous place.assembly of central coupler abc (new) for ksr as per drawing no. ep/dga-12m & nw/bda-8002/m. note: 1) material test certificate from nabl approved lab should be submitted along with the supply of material. 2) each unit should be embossed/engraved with makers, name, month, year and batch no of manufacturing at a conspicuous place.,assembly of central coupler abc (new) for ksr as per drawing no. ep/dga-12m & nw/bda- 8002/m. note: 1) material test certificate from nabl approved lab should be submitted along with the sup ply of material. 2) each unit should be embossed/engraved with makers, name, month, year and batch no of manufacturing at a conspicuous place. [ warranty period: 30 months after the date of delivery ] ]