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| All Patents in class 418/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 494,461 | Mar. 28, 1893 | F.H. Cathcart | Power-Driven Tool | ||
| 1,414,976 | May 02, 1922 | B.F. Augustine | Rotary Engine | rotary steam engines | |
| 2,377,299 | May 29, 1945 | A. Von Wangenheim | Rotary Pump | rotary pumps | |
| 2,435,279 | Feb. 03, 1948 | E.F. Hubacker | Pump, vane type | ||
| 2,460,047 | Jan. 25, 1949 | A. Von Wangenheim | Vane Pump and Pressure Control Means | vane pumps | |