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| All Patents in class 81/30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,305,249 | Jun. 03, 1919 | O.H. Buck | Attachment For Wrenches | wrench handle components | |
| 1,526,192 | Feb. 10, 1925 | E. Verstraete | Tool Holder | tool holders | |