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| All Patents in class 192/93B | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,140,326 | May 18, 1915 | B.M. Hanson | Clutch Mechanism | industrial machine clutches | |
| 1,699,968 | Jan. 22, 1929 | E.J. Hornberger | Friction Clutch | metalworking machine mechanisms | |