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| All Patents in class 192/70.28 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 683,647 | Oct. 01, 1901 | H.P. Claussen, G.C. Hinkley | Friction-clutch | |
| 1,272,081 | Jul. 09, 1918 | H.R. Nutting, A.B. Nutting | Clutch | ||
| 1,780,222 | Nov. 04, 1930 | E.P. Bullard, Jr., G.F. Kolb | Clutch | ||
| 1,808,240 | Jun. 02, 1931 | C.G. Mahana | Power Transmission Means | ||
 | 1,903,963 | Apr. 18, 1933 | G.W. Emrick | Multiple disk clutch | |
| 2,324,613 | Jul. 20, 1943 | W.W. Criley | Clutch | ||