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| All Patents in class 209/552 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,621,998 | Nov. 23, 1971 | V. Prochaska | Sheet grader | printer | |
| 5,161,697 | Nov. 10, 1992 | B.S. Quick | Apparatus for selecting wood stock to form panels of predetermined size | gluing machines | |