procurement of earth return brush assly etc.,earth return brush assly for traction motor type 253 bx/bw & 4601 az/bx f or emus m/s, mersen india pvt. ltd-grade-be-14zi (indigenous) & m/s assam carbon produt -grade-bm-51 (imported/indigenous). to specification drg.no.--er/kpa/el/bs.3u4.007e [gra de of carbon will be as per icfs latest approval m/s, mersen india pvt.ltd. -grade- be-14zi (indigenous) & m/s, assam carbon produts- grade- bm- 51( imported/indigenous) are latest approved grade of carbon vide icfs latest approval l/no. elec./w/iv-18, dtd.19.01.2019. [ warranty period: 30 months after the date of delivery ]