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| All Patents in class 266/97 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,462,072 | Feb. 22, 1949 | F.N. Darmara | Process of Inductively Heating Pliers | making pliers | |
| 2,500,989 | Mar. 21, 1950 | W.D. Whalen, A.H. Davis, A.L. Hartley | Metallurgical apparatus | flame hardening machines | |
| 2,523,883 | Sep. 26, 1950 | M. Garvin, D.M. Strauchen | Heat Treating Machine | heat treating machines | |
| 2,555,517 | Jun. 05, 1951 | M. Garvin, D.M. Strauchen | Automatic Heat Treating Machine | heat treating machines | |