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| All Patents in class 474/46 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,256,114 | Sep. 16, 1941 | D. Heyer | Variable speed drive with multiple belts | |
| 2,382,935 | Aug. 14, 1945 | J.B. Armitage | Variable Speed Drive Mechanism | ||
| 2,475,954 | Jul. 12, 1949 | W.E. Gerbing | Variable speed pulley | ||
| 2,714,313 | Aug. 02, 1955 | W.E. Gerbing | Variable pitch pulley | ||
| 2,893,253 | Jul. 07, 1959 | P.K. Beemer | Variable pitch pulley mechanism | ||
| 3,154,959 | Nov. 03, 1964 | B.N. Palm | Variable speed drive | ||