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| Patents for Viking Tool Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,659,963 | Nov. 24, 1953 | O.C. Severson | Toolholder | insert tool holders | |
| 3,027,623 | Apr. 03, 1962 | O.C. Severson | Clamp-Type Holder for Throw-Away and Indexable Cutting Inserts | insert tool holders | |