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Design and development of drill equipment

Drainage of methane from the overlying Pocahontas no. 4 coalbed from workings in the Pocahontas no. 3 coalbed

Published Year

• 1960-1969 (1)
• 1970-1979 (1)

Subject

• Coal mines and mining (2)
• Mine ventilation (2) *
• Boring machinery (1)
• Methane (1)

Author

• Cervik, Joseph, (2) *
• Finfinger, Gerald L. (1)
• Hadden, J. D. (1)

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