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| All Patents in class 237/8R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,144,108 | Jan. 17, 1939 | A.K. Foulds | Heating Apparatus | ||
| 2,155,890 | Apr. 25, 1939 | R.L. Campbell | Heating System | ||
| 2,176,852 | Oct. 17, 1939 | R.L. Campbell | Heating Method and Apparatus | ||
| 2,340,844 | Feb. 01, 1944 | E.J. Dillman | Heating Apparatus | ||