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| All Patents in class 236/9A | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,155,890 | Apr. 25, 1939 | R.L. Campbell | Heating System | ||
| 2,176,852 | Oct. 17, 1939 | R.L. Campbell | Heating Method and Apparatus | ||
| 2,310,494 | Feb. 09, 1943 | P.S. Russel | Heating System | ||
| 2,329,473 | Sep. 14, 1943 | W.S. Landon | Heating Apparatus | ||