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| All Patents in class 123/325 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 276,751 | May 01, 1883 | C.W. Baldwin | Gas Engine | ||
 | 445,110 | Jan. 20, 1891 | M.A. Graham | Gas Engine | |
| 448,597 | Mar. 17, 1891 | B.C. Vanduzen | Gas Engine | ||