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| All Patents in class 236/38 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,946,842 | Feb. 13, 1934 | E.J. Dillman | Temperature Control System | ||
| 1,992,155 | Feb. 19, 1935 | E.J. Dillman | Control Device | ||
| 2,189,895 | Feb. 13, 1940 | F.P. Grutzner | Heating and Ventilating System | ||