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| All Patents in class 192/89.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 917,312 | Apr. 06, 1909 | E.R. Klemm | Friction clutch mechanism | bench or pedestal grinders | |
| 1,192,793 | Jul. 25, 1916 | H. Manthey | Clutch | harvesters | |
| 2,492,545 | Dec. 27, 1949 | A.K. Watcher | Micrometer Adjusting Dial | metalworking machine mechanisms | |