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| All Patents in class 414/742 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,500,989 | Mar. 21, 1950 | W.D. Whalen, A.H. Davis, A.L. Hartley | Metallurgical apparatus | flame hardening machines | |
| 3,204,782 | Sep. 07, 1965 | G.A. Kendall, N.E. Hess | Mechanism for crankshaft lathes | crankshaft lathes | |