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| Patents for Wilbur C. De Graff | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,819,837 | Aug. 18, 1931 | W.C. De Graff | Chuck | metal lathe chucks | |
| 2,257,503 | Sep. 30, 1941 | W.C. De Graff, M.E. Lange | Turning Tool | lathe tools | |