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| All Patents in class 123/52.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 579,068 | Mar. 16, 1897 | E. Merry | Hydrocarbon Engine | ||
 | 627,219 | Jun. 20, 1899 | E.J. Woolf | Air and Gas Engine | |
| 662,155 | Nov. 20, 1900 | A.J. Signor | Multiple Cylinder Explosive Engine | ||