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| Patent FR489,933 | |||||
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| Number | Date | Patentee | Title | Type | |
| 489,933 | Jan. 17, 1893 | C.M. Conradson | Chuck for Screw Machines | metal lathe chucks | |
| FR-489,933 | Mar. 22, 1919 | H. Hunt, H.W. Hunt, P. Hunt | Machine for sharpening helicoidal drill tips | drill grinders | |