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| All Patents in class 221/184 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,111,833 | Sep. 29, 1914 | F.C. Hoffman | Nut-tapping machine | ||
| 1,558,079 | Oct. 20, 1925 | E.W. Duston, R.S. Crosby | Feeder for automatic metal-working machines | screw machines | |