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| All Patents in class 92/33 | |||||
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| Number | Date | Patentee | Title | Type | |
| RE6,292 | Feb. 16, 1875 | S. Ingersoll | Improvement in machines for drilling rock | mining apparatus | |
| 1,284,108 | Nov. 05, 1918 | C.A. Hultquist | Drilling Machine | ||