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| All Patents in class 477/111 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,527,247 | Feb. 24, 1925 | C. Bouillon | Electric Motor Driven Change Speed Device | ||
| 1,563,546 | Dec. 01, 1925 | C. Bouillon | Electric Motor Driven Change Speed Device | industrial machine speed and direction changing mechanisms | |
| 2,215,627 | Sep. 24, 1940 | J.M. Walter | Machine tool drive | milling machines | |