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| All Patents in class 266/129 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,378,890 | Jun. 26, 1945 | M.A. Crosby, H.H. Brown, P.A. Abe | Surface Hardening Metal Areas of Limited Size | metal hardening | |
| 2,462,072 | Feb. 22, 1949 | F.N. Darmara | Process of Inductively Heating Pliers | making pliers | |
| 2,665,126 | Jan. 05, 1954 | E.G. Roehm | Crankshaft Pin Hardening Machine | flame hardening machines | |