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| Patents for Donald K. Alexander | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,606,177 | Sep. 20, 1971 | D.K. Alexander, J.J. Denovan | Wood pulp grinder | |
 | 3,690,568 | Sep. 12, 1972 | D.K. Alexander | Wood grinding | |