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| All Patents in class 209/520 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,986,427 | Jan. 01, 1935 | J.A. Denton | Lumber sorter | sawmill accessories | |
| 3,080,969 | Mar. 12, 1963 | R.E. Blake | Sorting apparatus | sawmill lumber conveyors | |
| 3,292,783 | Dec. 20, 1966 | W.W. Quist, K.W. Bullock | Lumber sorter and stacker apparatus | woodworking material handling machines | |