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| All Patents in class 266/134 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 125,651 | Apr. 09, 1872 | J.A. Woodbury | Tempering the Treads of Car Wheels | ||
 | 1,866,827 | Jul. 12, 1932 | F.J. Vlchek | Manufacture of Swaged and Tempered Articles | |
 | 2,157,948 | May 09, 1939 | H.H. Beeny | Hardening of Metal Surfaces | |
| 2,294,187 | Aug. 25, 1942 | T.A. Waltz, A. Kullman | Apparatus for Heat Treating | ||
| 2,312,839 | Mar. 02, 1943 | T.A. Waltz, A. Kullman | Flame Hardening Of Rack Bars | ||
| 2,412,333 | Dec. 10, 1946 | A.L. Hartley | Flame Hardening Apparatus | ||