List of permissible self-contained oxygen breathing apparatus, gas masks, and hose masks

Year:	1931
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6494
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6494
Subjects:	Self-contained self-rescuer (Mine rescue equipment)
	Mine rescue work--Equipment and supplies
	Breathing apparatus
	Respirators (Medical equipment)
	Gas masks
Link:	https://hdl.handle.net/2027/mdp.39015077576711