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| Patents for N. S. Amstutz | |||||
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| Number | Date | Patentee | Title | Type | |
| 329,986 | Nov. 10, 1885 | P.A. Whitney | Ratchet Drill | drilling and boring | |
| 539,792 | May 28, 1895 | F.H. Bultman | Automatic gear-cutting and milling machine | gear making machines | |