Permissible electrically operated post drills and drilling machines

Author: Ilsley, L. C.
Additional Authors: Brunot, H. B., Gleim, E. J.
Year: 1938
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.23:3391
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 3391
Subject: Boring machinery
Link: https://hdl.handle.net/2027/mdp.39015078517938

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