roof bolting meaning in Hindi

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Roof bolt plates for mining and tunnel support
Research and development of new drilling bit for roof bolt driller
Galvanized mild steel roofing bolt and nut
Technique of combined supporting of roof bolting with bar and wire mesh in coal roadway
Expansion type roof bolt
Application of the technology of roof bolting with bar and wire mesh in the zhangji coal mine
Based on the rock pressure ' s characteristics of the pre - driven roadway , the rational support plan and parameters about roof bolting with bar and wire mesh are determined , and the manner of driven waste in place of coal was adopted