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| All Patents in class 431/280 | |||||
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| Number | Date | Patentee | Title | Type | |
| 397,903 | Feb. 19, 1889 | W.F. Folmer | Illuminating Apparatus | lamps | |
| 2,257,605 | Sep. 30, 1941 | A.L. Hartley | Adjustable flame hardening torch | flame hardening machines | |