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| All Patents in class 266/130 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,333,767 | Mar. 16, 1920 | C. Napier | Method of making tempered blades | making sawblades | |
| 2,247,494 | Jul. 01, 1941 | A.L. Hartley | Flame hardening apparatus | flame hardening machines | |
| 2,264,752 | Dec. 02, 1941 | W.F. Groene | Flame Hardening Machine | metalworking machines | |