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| All Patents in class 237/1R | |||||
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| Number | Date | Patentee | Title | Type | |
| 604,006 | May 10, 1898 | H.C. Duensing | Traction Wheel | traction engine wheels | |
| 2,256,303 | Sep. 16, 1941 | R.D. Williams | Recovery and Utilization of Waste Engine Heat | exhaust mechanisms | |