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| All Patents in class 285/81 | |||||
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| Number | Date | Patentee | Title | Type | |
| 116,090 | Jun. 20, 1871 | W.S. Pattin | Improvement in Extension-Shanks for Boring-Bits | drill bit extensions | |
| 3,071,398 | Jan. 01, 1963 | J.A. Henning | Locking Ring | industrial machine mechanisms | |