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Automatic safety block on drill sharpener

Petersen, Max S.
; 
Arthur Lakes Library
; 
Russell L. and Lyn Wood Mining History Archive
; 
United States. Bureau of Mines
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Date
1945-12
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Keywords
Mine safety
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Mining History - Images
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[Automatic safety block on drill sharpener].
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http://hdl.handle.net/11124/5988
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Abstract
C-1; Automatic safety block on drill sharpener. Mechanism locks operating throttle and maintains safety block between jaws by gravity except when foot pedal is depressed. - M. S. Petersen - Dec. 1945.
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