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| All Patents in class 474/33 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,151,189 | Mar. 21, 1939 | L. Coddington | Variable speed transmission mechanism | |
 | 2,186,477 | Jan. 09, 1940 | L. Coddington | Oiling system | |
 | 2,256,114 | Sep. 16, 1941 | D. Heyer | Variable speed drive with multiple belts | |
| 2,475,955 | Jul. 12, 1949 | W.E. Gerbing | Variable pitch pulley | ||
 | 2,502,976 | Apr. 04, 1950 | C. McLear | Variable speed pulley | |