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| All Patents in class 123/193.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 597,860 | Jan. 25, 1898 | S. Rolfe | Explosion Engine | oil engines | |
| 957,984 | May 17, 1910 | A.L. Mowry | Piston | rotary steam engines | |
| 2,136,416 | Nov. 15, 1938 | W.C. Dehn | Piston | pistons | |