Successful system for signaling from mine cages at rest or in motion

Author: Belser, Carl.
Year: 1944
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7305
Series: Information circular / Bureau of Mines ;
Report Number: 7305
Subject: Mines and mineral resources--Safety measures
Link: https://hdl.handle.net/2027/mdp.39015074127278

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