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| Patents for Franck L. Durand | |||||
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| Number | Date | Patentee | Title | Type | |
| 299,362 | May 27, 1884 | A.E. Ellinwood | Spring-loaded, specially shaped jaws will grip either straight-shanked or tapered bits. | ||
| 572,827 | Dec. 08, 1896 | A.F. Radant | Calipers | calipers | |