Safeguarding electrical equipment used in gassy mines :European practice:

Author:	Ilsley, L. C.
Year:	1929
Document Type:	MAIN
SUDOC:	C 22.11:6146
Series:	Information circular / Bureau of Mines ;
Report Number:	6146
Subjects:	Coal mines and mining--France
	Coal-mining machinery--France--Safety
Link:	https://hdl.handle.net/2027/mdp.39015095078492