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| All Patents in class 269/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,403,958 | Jan. 17, 1922 | H.V. Holman | Hand-Screw Clamp | hand screws | |
| 1,809,768 | Jun. 09, 1931 | M. Wetzler | Clamping Device | miter and corner clamps | |