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| All Patents in class 221/156 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,476,064 | Dec. 04, 1923 | T. Eynon | Bolt-hoppering machine | ||
| 1,558,079 | Oct. 20, 1925 | E.W. Duston, R.S. Crosby | Feeder for automatic metal-working machines | screw machines | |
| 2,744,612 | May 08, 1956 | J.K. Rye, J.G. Kay | Orienter | metalworking machine mechanisms | |