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| All Patents in class 266/274 | |||||
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| Number | Date | Patentee | Title | Type | |
| 10,404 | Jan. 10, 1854 | C.W. Fillmore | Clamp for Holding Steel Plates | ||
| 65,598 | Jun. 11, 1867 | E.S. Piper | Improvement in hardening saws | tool making machines | |
| 385,347 | Jul. 03, 1888 | J.G. Folsom | Metal Hardening Device | heat treating machines | |