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| All Patents in class 418/1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 986,502 | Mar. 14, 1911 | A.C. Roessler | Rotary compressor | air compressors | |
| 2,887,065 | May 19, 1959 | A.S. Johnson | Gear Pump Unit | rotary pumps | |