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| Patents for Alex Barkoff | |||||
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| Number | Date | Patentee | Title | Type | |
| 344,580 | Jun. 29, 1886 | W.W. Hubbard | Lathe | metal lathe accessories and attachments | |
| 490,503 | Jan. 24, 1893 | G.S. Rominger | Worm Gear Cutting Machine | gear making machines | |