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| Patents for John E. Whitcomb | |||||
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| Number | Date | Patentee | Title | Type | |
| 167,974 | Sep. 21, 1875 | G.F. Ballou | Slide Rests for Metal Turning Lathes | metal lathes | |
| 171,082 | Dec. 14, 1875 | G.F. Ballou | Chuck and Centerer | metal lathe chucks | |