Safeguarding electrical equipment used in gassy mines :European practice.

Author:	Ilsley, L. C.
Year:	1929
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6134
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6134
Subjects:	Coal-mining machinery--Safety--Great Britain
	Coal mines and mining--Great Britain
Link:	https://hdl.handle.net/2027/mdp.39015077570250