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| All Patents in class 123/73AV | |||||
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| Number | Date | Patentee | Title | Type | |
| 111,087 | Jan. 17, 1871 | A.K. Rider | Hot Air Engine | hot air engines | |
| 810,495 | Jan. 23, 1906 | W.G. Miller | Gas Engine | internal combustion engines | |