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| All Patents in class 60/737 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 421,477 | Feb. 18, 1890 | J.C. Beckfeld, A. Schmid | Gas Engine | ||
| 611,813 | Oct. 04, 1898 | G.A. Marconnett | Thermal Expansion Engine | ||