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Progress 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

Bit gage v. drilling speed

Mount Weather testing adit :progress report 1


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