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| Patents for Roar H. Bergström | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,148,852 | Feb. 28, 1939 | R.H. Bergström | Holder Block for Tool Holders | ||
| 2,150,959 | Mar. 21, 1939 | R.H. Bergström | Tool Holder | ||