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| All Patents in class 236/21B | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,295,455 | Sep. 08, 1942 | E.J. Dillman | Control System | ||
| 2,389,111 | Nov. 13, 1945 | E.J. Dillman | Control Means | ||
| 2,389,519 | Nov. 20, 1945 | W.S. Landon | Burner Control Means | ||
| 2,406,228 | Aug. 20, 1946 | W.S. Landon | Burner Control Means | ||