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| Patents for Elizabeth Gray | |||||
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| Number | Date | Patentee | Title | Type | |
| 649,504 | May 15, 1900 | J.R. Back | Turning-lathe | metal lathes | |
| 651,908 | Jun. 19, 1900 | O.S. Walker | Magnetic Chuck | magnetic chucks | |
| 665,381 | Jan. 01, 1901 | H.G. Barr | Upright drilling-machine | drill presses | |