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| Patents for Thorvald Petersen | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,005,161 | Jun. 18, 1935 | T. Petersen | Pipe vise | pipe and chain vises | |
| 2,127,008 | Aug. 16, 1938 | T. Petersen | Vise | bench vises | |