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| All Patents in class 431/61 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,747,365 | Feb. 18, 1930 | F. Hardinge | Oil burner | industrial furnaces | |
| 1,792,222 | Feb. 10, 1931 | H.H. Hardinge | Oil burner | industrial furnaces | |