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Hot milling of rock-drill bits at the mines of the Vinegar Hill Zinc Co., Platteville, Wis.

Published Year

• 1930-1939 (1)

Subject

• Bits (Drilling and boring) (1)
• Drilling and boring (1)
• Rock-drills (1) *
• Zinc mines and mining--Wisconsin (1)

Author

• Agnew, Wing G. (1) *

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