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| All Patents in class 148/639 | |||||
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| Number | Date | Patentee | Title | Type | |
| 140,390 | Jul. 01, 1873 | L.W. Stuart | Improvement in Process of Hardening Edge Tools | ||
| 237,915 | Feb. 15, 1881 | G.F. Simonds | Methd of correcting unequal tension in circular saws | tool making machines | |
| 2,154,947 | Apr. 18, 1939 | H.H. Beeny, A.H. Lloyd | Hardening Metal Surfaces | flame hardening machines | |