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| All Patents in class 123/323 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 575,502 | Jan. 19, 1897 | W.L. Crouch | Gas Engine | ||
| 584,622 | Jun. 15, 1897 | J.O. Brown | Gas Engine | ||
 | 862,599 | Aug. 06, 1907 | L.W. Witry | Speed-regulating device for explosive-engines | |