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| All Patents in class 418/137 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 155,722 | Oct. 06, 1874 | L.D. Green | Improvement in rotary pumps | |
| 449,325 | Mar. 31, 1891 | W.J. Kendig | Rotary Engine | ||
| 453,612 | Jun. 09, 1891 | S.G. Brosius | Rotary Engine | ||