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| Patents for William W. Showler | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,001,558 | Sep. 26, 1961 | W.W. Showler | Interchangeable wood cutter head | cutterheads | |
| CA-643,022 | Jun. 19, 1962 | W.W. Showler | Interchangeable wood cutter head | cutterheads | |