Permissible mine equipment approved during the calendar year 1947 :supplement to Information Circular 7432

Author:	Hooker, A. B.
Year:	1947
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7465
Series:	Information circular / Bureau of Mines ;
Report Number:	7465
Subjects:	Coal mines and mining--Safety measures
	Mine safety
	Mining machinery
Link:	https://hdl.handle.net/2027/mdp.39015077578444