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| All Patents in class 60/320 | |||||
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| Number | Date | Patentee | Title | Type | |
| 432,114 | Jul. 15, 1890 | G.B. Brayton | Gas and Air Engine | ||
| 575,720 | Jan. 26, 1897 | J. Ledent | Gas Engine | cooling apparatus | |
| 2,200,379 | May 14, 1940 | R.D. Williams | Utilization of Waste Engine Heat | exhaust mechanisms | |