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| All Patents in class 126/101 | |||||
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| Picture | Number | Date | Patentee | Title | |
| AI131 | Feb. 05, 1856 | L.W. Leeds, R.M. Smith | Hydraulic heater | ||
| 2,200,379 | May 14, 1940 | R.D. Williams | Utilization of Waste Engine Heat | ||
| 4,420,677 | Dec. 13, 1983 | E.J. Partington | Heating system | ||