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Evolution of methane detecting devices for coal mines

Permissible methane detectors

Permissible methane detectors

Published Year

• 1930-1939 (2)
• 1940-1949 (1)

Subject

• Methane (3) *
• Coal mines and mining--Safety measures (1)
• Detectors (1)
• Firedamp (1)
• Gas detectors (1)

Author

• Hooker, A. B. (3)
• Ilsley, L. C. (3) *

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