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| All Patents in class 403/7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 521,055 | Jun. 05, 1894 | C.W. Shartle | Slip-collar for pulleys, shafts, &c. | industrial machine pulleys and belt drive mechanisms | |
| 1,797,730 | Mar. 24, 1931 | E.M. Pfauser | Socket Attachment for Tools | socket wrenches | |