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| All Patents in class 417/270 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,787 | Jun. 15, 1909 | R. Janney | Variable Speed Transmission Device | industrial machine speed and direction changing mechanisms | |
| 1,621,495 | Mar. 22, 1927 | C.M. Conradson | Rotary Pump | rotary pumps | |
| 2,164,888 | Jul. 04, 1939 | F.S. Haas, H. Ernst, B. Sassen | Variable Delivery Pump | grinding machines | |