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| All Patents in class 433/141 | |||||
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| Number | Date | Patentee | Title | Type | |
| 143,084 | Sep. 23, 1873 | J.K. Laudermilch | Improvement in jeweler's drilling devices | spiral drills | |
| 157,099 | Nov. 24, 1874 | D.D. MacKay | Improvement in hand-drills for drilling metal | hand drills | |