Inventions by "men at the mines," which were displayed at Annual Coal Convention: Rail Bond Tester, designed by J. E. ROBLEE; Compromise Rail Joint, W. F. WRIGHT; Shaft Extractor, E. A. PRUDENT; Steel Mine Car Straightener, W. T. DALTON; Utility Buggy, D. LOCKE; Safety Motor Suspension, J. P. JONES.
Miners' exhibit
Min Congress J
Mining Congress Journal ; 25 , n 10
1939
3 pages
Article (Journal)
English
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