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7 results returnedProgress report on investigation of detachable rock-drill bits
Hot milling of rock-drill bits at the mines of the Vinegar Hill Zinc Co., Platteville, Wis.
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
Subject
- Bits (Drilling and boring) (7) *
- Drilling and boring (7)
- Rock-drills (5)
- Zinc mines and mining--Wisconsin (1)
Author
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