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All Patents in class 239/132.3 | |||||
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Number | Date | Patentee | Title | Type | |
2,247,494 | Jul. 01, 1941 | A.L. Hartley | Flame hardening apparatus | flame hardening machines | |
2,621,717 | Dec. 16, 1952 | M. Garvin, D.M. Strauchen | Annular Torch Head for Flame Hardening Machines | flame hardening machines |