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| All Patents in class 148/646 | |||||
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| Number | Date | Patentee | Title | Type | |
| 125,650 | Apr. 09, 1872 | J.A. Woodbury | Improvement in Tempering Steel Railrod Rails | track and switches | |
| 150,625 | May 05, 1874 | J.A. Ferson, G.F. Simonds | Tempering and Forming Articles of Steel | tool making machines | |
| 2,867,556 | Jan. 06, 1959 | G.E. Tegen | Method of Flame Hardening | heat treating machines | |