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| Patents for Hugh Drysdale | |||||
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| Number | Date | Patentee | Title | Type | |
| 437,292 | Sep. 30, 1890 | H. Drysdale | Turret Head Lathe | turret lathes | |
| 493,019 | Mar. 07, 1893 | H. Drysdale | Turret Lathe | turret lathes | |