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| Patents for William J. Hagman | |||||
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| Number | Date | Patentee | Title | Type | |
| 815,696 | Mar. 20, 1906 | W.J. Hagman | Counterbalance Device | metal planer accessories | |
| 1,296,795 | Mar. 11, 1919 | W.J. Hagman | Planer and Attachment Therefor | metal planer accessories | |