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| All Patents in class 474/35 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,256,114 | Sep. 16, 1941 | D. Heyer | Variable speed drive with multiple belts | |
| 2,501,450 | Mar. 21, 1950 | G.K. McKee | Machine tool transmission | ||
| 2,557,849 | Jun. 19, 1951 | F.C. Victory | Variable-Speed Drive | ||