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| All Patents in class 60/729 | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,866 | Jun. 09, 1863 | S.H. Roper | Hot Air Engine | hot air engines | |
| 90,128 | May 18, 1869 | P. Shaw | Hot Air Engine | hot air engines | |
| 611,125 | Sep. 20, 1898 | H.A. Humphrey | Gas or Oil Motor Engine | gas and gasoline engines | |