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| All Patents in class 173/97 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,252,374 | Jan. 01, 1918 | G.H. Gilman | Drilling Machine | ||
| 1,252,375 | Jan. 01, 1918 | G.H. Gilman | Drilling Apparatus | ||
| 2,919,901 | Jan. 05, 1960 | R.L. Sandvig | Drill system with suction | ||
| 3,269,466 | Aug. 30, 1966 | W.G. Mitchell | Impact tool | impact chisels and drills | |