Noise abatement of pneumatic rock drill

Author:	Summers, Charles R.
Additional Authors:	Murphy, John N.,
Year:	1974
Document Type:	USBM
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:7998
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	7998
Subjects:	Coal mines and mining--Noise control
	Rock-drills
	Pneumatic machinery
Links:	https://hdl.handle.net/2027/mdp.39015078543041
	https://hdl.handle.net/2027/pst.000029752133