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| All Patents in class 110/190 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,880,624 | Oct. 04, 1932 | T.A. Kennedy, J.B. Willsea | Furnace | ||
| 2,141,711 | Dec. 27, 1938 | B.M. Guthrie | Automatic Air Control Means | ||