Automatic power releases for shutting off power from mine and indicating by signal alarm when fan stops or doors are left open / by W.J. Fene and R.F. Dalrymple.
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Format: | Government Document Book |
Language: | English |
Published: |
[Washington, D.C.?] :
U.S. Dept. of Commerce, Bureau of Mines,
1930.
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Series: | Information circular (United States. Bureau of Mines) ;
6288. |
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