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| All Patents in class 175/217 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,282,928 | Oct. 29, 1918 | R.S. Peirce | Drill | ||
| 1,285,712 | Nov. 26, 1918 | H.R. Hughes | Horizontal Drilling Machine | ||
| 1,803,307 | Apr. 28, 1931 | O.P. Wodack | Portable electric tool | handheld power drills | |