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Progress report on investigation of detachable rock-drill bits

Progress report no. 2 on investigation of detachable rock-drill bits

Progress report 4 on investigation of detachable rock-drill bits

Progress report no. 3 on investigation of detachable rock-drill bits

Published Year

• 1930-1939 (4)

Subject

• Bits (Drilling and boring) (4) *
• Drilling and boring (4)
• Rock-drills (4) *

Author

• Mosier, McHenry. (4) *

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