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| All Patents in class 175/121 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 335,758 | Feb. 09, 1886 | A. John | Drilling Machine | ||
| 492,118 | Feb. 21, 1893 | J.T. Snyder | Drilling machine (for mining coal, but brace configuration) | ||
| 639,267 | Dec. 19, 1899 | W.T. Moss | Mining Machine | ||
| 643,083 | Feb. 06, 1900 | M.C. Bullock, deceased (Estate of), M.A. Bullock, Executrix | Thrust Register for Drilling Machines | ||