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| All Patents in class 123/66 | |||||
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| Number | Date | Patentee | Title | Type | |
| 628,316 | Jul. 04, 1899 | J.A. Harp | Gasolene or Gas Engine | gas and gasoline engines | |
| 636,298 | Nov. 07, 1899 | F.H. Smith | Explosion Engine | gas and gasoline engines | |
| 2,561,093 | Jul. 17, 1951 | V.W. Breitenstein, E.R. Boddinghouse | Internal-combustion rammer | handheld power tools | |