Breaking coal with airdox

Author: Malesky, J. S.
Year: 1948
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7480
Series: Information circular / Bureau of Mines ;
Report Number: 7480.
Subjects: Coal mines and mining--Safety measures
Coal mines and mining--Equipment and supplies
Coal mines and mining--Electric equipment
Compressed air
Link: https://hdl.handle.net/2027/mdp.39015078463588

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