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| All Patents in class 123/405 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 194,047 | Aug. 14, 1877 | N.A. Otto | Gas-Motor engines | |
| 273,750 | Mar. 13, 1883 | H.S. Maxim | Gas Engine | ||
| 307,057 | Oct. 21, 1884 | S. Lawson | Gas Engine | ||
 | 416,649 | Dec. 03, 1889 | C. Sintz | Gas Engine | |
| 442,963 | Dec. 16, 1890 | J.H. Eichler | Rotary Gas Engine | ||
 | 445,110 | Jan. 20, 1891 | M.A. Graham | Gas Engine | |
| 535,964 | Mar. 19, 1895 | H. Swain | Gas Engine | ||
| 542,972 | Jul. 16, 1895 | J. Bryan | Gas Engine | ||
| 556,086 | Mar. 10, 1896 | H.G. Carell | Gas Engine | ||
| 558,369 | Apr. 14, 1896 | J.W. Eisenhuth | Gas Engine | ||