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| All Patents in class 173/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 639,267 | Dec. 19, 1899 | W.T. Moss | Mining Machine | mining apparatus | |
| 1,110,319 | Sep. 15, 1914 | A.F. Froussard | Tube Cleaner | tube cleaning machines | |
| 1,491,523 | Apr. 22, 1924 | G.H. Ekstrom | Adjustable drilling and balancing tool | balancing machinery | |
| 2,976,436 | Mar. 21, 1961 | N. Anton | Multi-speed drill | handheld power drills | |