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| All Patents in class 403/324 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,790,238 | Jan. 27, 1931 | W.F. Klein | Socket Connection | |
 | 1,896,645 | Feb. 07, 1933 | E.M. Pfauser | Coupling For Socket Wrenches | |
 | RE19,093 | Feb. 27, 1934 | E.M. Pfauser | Coupling For Socket Wrenches | |
| 4,936,701 | Jun. 26, 1990 | J.S. Amtmann, K.D. Allen | Universal Joint with Rotating Holder Sleeve | ||