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| All Patents in class 236/8 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,619,470 | Mar. 01, 1927 | F. Hardinge | Oil burning mechanism | |
| 1,932,574 | Oct. 31, 1933 | M.D. Church | Method and Apparatus for Controlling the Heating of a Fluid | ||