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| All Patents in class 123/51AC | |||||
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| Number | Date | Patentee | Title | Type | |
| 652,382 | Jun. 26, 1900 | J.H. Atterbury | Gas Engine | gas and gasoline engines | |
| 667,846 | Feb. 12, 1901 | S. Miller | Explosion Engine or Motor | internal combustion engines | |