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| All Patents in class 123/51A | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 179,782 | Jul. 11, 1876 | F.W. Gilles | Gas Engine | |
| 213,539 | Mar. 25, 1879 | W. Hees, W. Wittig | Gas-Engine | ||
 | 232,987 | Oct. 05, 1880 | C. Linford | Gas Engine | |
 | 336,505 | Feb. 16, 1886 | J. Atkinson | Gas Engine | |
| 448,924 | Mar. 24, 1891 | O. Kosztovits | Gas Engine | ||
| 450,406 | Apr. 14, 1891 | J. Fielding | Gas Engine | ||
| 497,239 | May 09, 1893 | W.W. Grant | Gas Engine | ||
| 528,489 | Oct. 30, 1894 | J. Paterson | Gas Engine | ||
| 531,861 | Jan. 01, 1895 | C.M. Rhodes | Gas Engine | ||
| 532,555 | Jan. 15, 1895 | F. Hirsch | Gas Engine | ||