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| Patents for Oscar E. Hadwiger | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,145,980 | Feb. 07, 1939 | O.E. Hadwiger, H.O. Schmidt | Sandpaper drum | |
 | 2,440,440 | Apr. 27, 1948 | O.E. Hadwiger | Edge sanding machine | |