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| All Patents in class 239/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,455,049 | May 15, 1923 | F. Hardinge | Oil burner | industrial furnaces | |
| 1,735,245 | Nov. 12, 1929 | F. Hardinge | Oil burner | industrial furnaces | |