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Tender For corrigendum : outsourcing for manufacturing of 20mm dia roofbolts using sccl machinery at central workshop on piece rated basis along with supply and fixing of nut, domed washer and conical seat.
Tender For corrigendum : re-support work by approved portable hydraulic roofbolting machine suitable with all electrical accessories, wet drilling arrangement to drill 1.5/1.8 mtr. long hole in roof with 27mm dia drill bit for anchoring 20/22 mm... at umaria colliery