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| All Patents in class 175/207 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,278,084 | Sep. 10, 1918 | J.R. Abbott | Drill | ||
| 3,057,417 | Oct. 09, 1962 | R.L. Sandvig | Drill system with suction removal of cuttings | ||