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| All Patents in class 237/2A | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,189,895 | Feb. 13, 1940 | F.P. Grutzner | Heating and Ventilating System | ||
| 2,266,193 | Dec. 16, 1941 | F.P. Grutzner | Heating System | ||