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| All Patents in class 475/328 | |||||
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| Number | Date | Patentee | Title | Type | |
| 800,268 | Sep. 26, 1905 | C.M. Conradson | Speed Changing Mechanism | metalworking variable speed mechanisms | |
| 812,533 | Feb. 13, 1906 | H.A. Tuttle | Reversing-gear | industrial machine gearing | |
| 1,291,560 | Jan. 14, 1919 | E.T. Larkin | Reversing Gearing. | reverse gear apparatus | |