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| All Patents in class 137/520 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 168,623 | Oct. 11, 1875 | G.W. Daimler | Air and Gas Engine | ||
 | 284,556 | Sep. 04, 1883 | G.M. Hopkins | Gas Engine | |
| 2,141,711 | Dec. 27, 1938 | B.M. Guthrie | Automatic Air Control Means | ||