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| All Patents in class 175/212 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,252,374 | Jan. 01, 1918 | G.H. Gilman | Drilling Machine | |
| 1,257,561 | Feb. 26, 1918 | W. Weber | Chamering Device for Rock Drills | ||
| 1,282,928 | Oct. 29, 1918 | R.S. Peirce | Drill | ||
 | 1,803,307 | Apr. 28, 1931 | O.P. Wodack | Portable electric tool | |
 | 3,057,417 | Oct. 09, 1962 | R.L. Sandvig | Drill system with suction removal of cuttings | |