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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

Bit gage v. drilling speed

Mount Weather testing adit :progress report 1

Published Year

• 1930-1939 (6)

Subject

• Bits (Drilling and boring) (6)
• Drilling and boring (6) *
• Rock-drills (4)

Author

• Mosier, McHenry. (6) *
• Agnew, Wing G. (2)

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