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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

Inspection and maintenance of mine hoisting ropes

Bit gage v. drilling speed

Mount Weather testing adit :progress report 1

Published Year

• 1930-1939 (7) *

Subject

• Bits (Drilling and boring) (6)
• Drilling and boring (6)
• Rock-drills (4)
• Hoisting machines (1)
• Mine hoisting (1)

Author

• Mosier, McHenry. (7) *
• Agnew, Wing G. (2)
• Ilsley, L. C. (1)

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