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| All Patents in class 192/70.12 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,601,235 | Sep. 28, 1926 | G.F. Kolb, E.P. Bullard, Jr. | Clutch | ||
| 1,808,240 | Jun. 02, 1931 | C.G. Mahana | Power Transmission Means | ||
| 2,290,542 | Jul. 21, 1942 | W.W. Criley | Clutch | ||