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| All Patents in class 266/249 | |||||
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| Number | Date | Patentee | Title | Type | |
| 65,946 | Jun. 18, 1867 | C. Richardson | Improved Apparatus for Tempering Steel Plates | tool making machines | |
| 150,289 | Apr. 28, 1874 | W. Clemson | Improvement in apparatus for tempering saws | making sawblades | |
| 1,253,966 | Jan. 15, 1918 | F.W. Harris | Process and Apparatus for Treating Drill Pipe | oilfield machinery | |