corrigendum : drilling for 1612.5 mtrs 46 no of 300 mm finished dia bore holes including supplying and lowering of 200 mm dia of casing pipe ms erw pipe is 1239 3589 with 6 mm thick for stabilisation purpose and over waterlogged workings on surface by hydropneuma
Description :drilling for 2329 mtrs of 300 mm finished dia 38 nos bore holes including supplying and lowering of 200 mm dia of casing pipe ms erw black pipe is 1239 3589 with 6 mm thick 159102 : deulbera colliery
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