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| All Patents in class 237/8A | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,208,157 | Jul. 16, 1940 | F.P. Grutzner | System for Recovering and Utilizing Waste Heat | exhaust mechanisms | |
| 2,996,222 | Aug. 15, 1961 | L.A. Botkin | Airport hydrant system | ||
| 4,420,677 | Dec. 13, 1983 | E.J. Partington | Heating system | ||