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| All Patents in class 192/111.6 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 943,142 | Dec. 14, 1909 | A.L. De Leeuw | Variable Speed Driving Mechanism | ||
 | 1,291,883 | Jan. 21, 1919 | J.B. Highland | Friction-clutch | |
| 1,625,738 | Apr. 19, 1927 | L.F. Nenninger | Machine Tool Clutch | ||
| 2,031,133 | Feb. 18, 1936 | R. Schümann | Electric Hand Tool | ||