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| All Patents in class 408/73 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,983,189 | Dec. 04, 1934 | A.J. Prance | Thread cutting tool | tapping heads and chucks | |
| 2,189,604 | Feb. 06, 1940 | F.P. Healy | Boring bar guiding mechanism | boring bars | |