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| All Patents in class 266/111 | |||||
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| Number | Date | Patentee | Title | Type | |
| 453,162 | May 26, 1891 | E.E. Ries | Apparatus for Hardening and Tempering Steel and Iron | heat treating machines | |
| 1,221,576 | Apr. 03, 1917 | C. Napier | Manufacture of tempered saw-blades | making sawblades | |