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| All Patents in class 237/19 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,176,852 | Oct. 17, 1939 | R.L. Campbell | Heating Method and Apparatus | ||
| 2,208,157 | Jul. 16, 1940 | F.P. Grutzner | System for Recovering and Utilizing Waste Heat | ||
| 2,266,193 | Dec. 16, 1941 | F.P. Grutzner | Heating System | ||