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| All Patents in class 269/133 | |||||
| Number | Date | Patentee | Title | Type | |
| 342,187 | May 18, 1886 | C.W. Cornell | Clamp | clamps | |
| 2,605,795 | Aug. 05, 1952 | M.V. Tracy | Automatically clamping work-supporting stand | work holding | |