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