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Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.

Bit ignition potential with worn carbide tips

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)

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