Shot firing in coal mines by electricity controlled from outside

Author: Clark, H. H.
Additional Authors: Means, Charles M., Breth, N. V.
Year: 1915
Document Type: USBM
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.7:108
Series: Technical paper / United States Department of the Interior, Bureau of Mines ;
Report Number: 108
Subject: Electricity in mining
Link: https://hdl.handle.net/2027/mdp.39015077561473

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