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| Patents for Walter C. Bergstrom | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,829,543 | Apr. 08, 1958 | W.C. Bergstrom | Countersinking, counterboring, and deburring tool | ||
| 2,829,544 | Apr. 08, 1958 | W.C. Bergstrom | Countersinking and counterboring tool | metalworking countersinks | |