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| All Patents in class 221/251 | |||||
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| Number | Date | Patentee | Title | Type | |
| 257,032 | Apr. 25, 1882 | H.M. Loud | Log feeder and turner | sawmill accessories | |
| 1,254,176 | Jan. 22, 1918 | L.W. Thorsell | Automatic Thread Rolling Machine | ||
| 1,964,937 | Jul. 03, 1934 | L.A. Dumser, C.J. Schroeder | Machine tool | ||
| 2,570,660 | Oct. 09, 1951 | R.M. Gamble | Transfer Mechanism | workpiece changers and storage mechanisms | |
| 2,906,072 | Sep. 29, 1959 | E.C. Carlson | Can Cover Feed | metalworking machine mechanisms | |