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| All Patents in class 209/521 | |||||
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| Number | Date | Patentee | Title | Type | |
| 268,810 | Dec. 12, 1882 | F. McDonough | Lumber-assorter | woodworking machine material handling | |
| 674,455 | May 21, 1901 | T.E. Comly | Timber-separator | woodworking machine mechanisms | |
| 964,670 | Jul. 19, 1910 | M. Moncreiffe | Lumber-sorter | ||
| 5,351,833 | Oct. 04, 1994 | B.S. Quick | Method for selecting wood stock to form panels of predetermined size | ||