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| All Patents in class 237/49 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,957,616 | May 08, 1934 | F. Schimmel | Heating system | ||
| 2,256,303 | Sep. 16, 1941 | R.D. Williams | Recovery and Utilization of Waste Engine Heat | exhaust mechanisms | |