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| All Patents in class 266/90 | |||||
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| Number | Date | Patentee | Title | Type | |
| 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 | |
| 2,665,126 | Jan. 05, 1954 | E.G. Roehm | Crankshaft Pin Hardening Machine | flame hardening machines | |