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| All Patents in class 91/197 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 51,166 | Nov. 28, 1865 | J.S. Foster | Revolving Cylinder Engine | ||
| 448,121 | Mar. 10, 1891 | L. Carter, W. Carter | Rotary Engine | ||
| 925,149 | Jun. 15, 1909 | C.R. Wolcott | Rotary Motor | ||