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| All Patents in class 123/51R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 232,987 | Oct. 05, 1880 | C. Linford | Gas Engine | |
| 448,924 | Mar. 24, 1891 | O. Kosztovits | Gas Engine | ||
| 531,861 | Jan. 01, 1895 | C.M. Rhodes | Gas Engine | ||
| 636,048 | Oct. 31, 1899 | E.H. Korsmeyer | Gasolene or Gas Engine | ||
| 644,004 | Feb. 20, 1900 | J.F. Craig | Explosive Eugine | ||
| 661,300 | Nov. 06, 1900 | F.L. Antisell, T.M. Antisell | Explosive-Gas Engine | ||
| 680,985 | Aug. 20, 1901 | W.S. Sharpneck | Multiple Piston Explosive Engine | ||