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Permissible electrically operated pumps
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Published Year
1940-1949 (1)
Subject
Coal-mining machinery--Electric equipment (1)
Coal-mining machinery--Safety measures (1)
Coal-mining machinery--Testing (1)
Mine pumps (1) *
Author
Brunot, H. B. (1)
Gleim, E. J. (1)
Ilsley, L. C. (1) *
