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U.S. Bureau of Mines develops low-noise percussive drill.
Bartholomae RC; Kovac JG
Proc Underground Coal Mining Symp Coal Age Conf and Expo V 1979 Oct; :101-104
OP; Conference/Symposia Proceedings
Proc. Underground Coal Mining Symp., Coal Age Conf. and Expo V, October 1979,
Page last reviewed: November 12, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division