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| All Patents in class 266/112 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 453,162 | May 26, 1891 | E.E. Ries | Apparatus for Hardening and Tempering Steel and Iron | ||
 | 1,350,618 | Aug. 24, 1920 | C. Napier | Apparatus for making tempered blades | |
| 3,604,691 | Sep. 14, 1971 | W.G. Sherwood | Apparatus and method for coiling and quenching rod | ||