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| All Patents in class 239/543 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 367,945 | Aug. 09, 1887 | C.M. Young | Burner for Natural Gas | ||
| 2,378,001 | Jun. 12, 1945 | F.E. Drummond | Flame Hardening Torch | ||