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| Patents for Grover Plein | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,054,142 | Feb. 25, 1913 | G. Plein | Spiral tool-driver | spiral screwdrivers | |
| 1,107,701 | Aug. 18, 1914 | G. Plein | Spiral tool-driver | spiral screwdrivers | |