Browse TRAIL Inventories

Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.

Development of a successful multiple percussion drill carriage

Laboratory studies of variables in rotary drilling

Noise from pneumatic rock drills :measurement and significance

Energetics of percussive drills

Percussive drilling with independent rotation

Development of a high energy impact breaker for shaft sinking :initial feasibility and field trials in a rectangular shaft : final report


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