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| All Patents in class 74/448 | |||||
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| Number | Date | Patentee | Title | Type | |
| 482,864 | Sep. 20, 1892 | C.M. Conradson | Split wheel | industrial machine pulleys and belt drive mechanisms | |
| 1,176,787 | Mar. 28, 1916 | G.L. Swabb | Gear | industrial machine gearing | |
| 2,707,884 | May 10, 1955 | J. Boisvert | Composite gear wheel | ||