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| All Patents in class 60/321 | |||||
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| Number | Date | Patentee | Title | Type | |
| 900,083 | Oct. 06, 1908 | C.A. Clark | Gas Engine | internal combustion engines | |
| 1,260,847 | Mar. 26, 1918 | A. Winton | Explosive Engine | valve gear | |
| 2,494,947 | Jan. 17, 1950 | J. Kuttner | Engine Manifold Construction | exhaust mechanisms | |