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| All Patents in class 74/544 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,282,148 | May 05, 1942 | S. Mandl | Tool Handle | wrench handle components | |
| 2,520,652 | Aug. 29, 1950 | S. Mandl, E.M. Pfauser | Adjustable Tool Handle | wrench handle components | |
| 2,899,839 | Aug. 18, 1959 | C. Zelnick | Apparatus for extending the length of a measuring tape winding crank handle | ||