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Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.
Bit ignition potential with worn carbide tips
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Published Year
1950-1959 (1)
1980-1989 (1)
Subject
Carbide cutting tools (2) *
Coal mines and mining--United States--Equipment and supplies (1)
Drilling and boring machinery (1)
Iron mines and mining--Michigan (1)
Author
Hanson, Bruce D. (1)
Lewis, Walter E. (1)
Roepke, Wallace W. (1)
