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