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| All Patents in class 137/405 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,792,222 | Feb. 10, 1931 | H.H. Hardinge | Oil burner | industrial furnaces | |
| 2,494,394 | Jan. 10, 1950 | W.S. Landon | Heating Apparatus and Fuel Flow Controlling Means Therefor | heating apparatus | |