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| All Patents in class 237/2R | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,295,455 | Sep. 08, 1942 | E.J. Dillman | Control System | ||
| 2,363,696 | Nov. 28, 1944 | P.s. Russel | Control System | ||
| 2,466,582 | Apr. 05, 1949 | E.J. Dillman | Speed and Altitude Responsive Control for Aircraft Heaters | ||