Permissible mine equipment approved during the calendar year 1950

Author: Brunot, H. B.
Year: 1951
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7606
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 7606
Subjects: Mining machinery--Standards--United States
Coal-mining machinery--Standards--United States
Link: https://hdl.handle.net/2027/mdp.39015078456178

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