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| All Patents of Type: counterbores reamers and countersinks | |||||
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| Number | Date | Patentee | Title | Type | |
| 339,197 | Apr. 06, 1886 | A. Latham | Machine for Forming Counterbores Reamers and Countersinks | counterbores reamers and countersinks | |
| 498,240 | May 30, 1893 | R. Conrader | Reamer Grinding Machine | tool grinders | |