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| All Patents in class 144/234 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,054,828 | Sep. 22, 1936 | A.G. Melde | Cutter Head and Cutter Mounting Means | ||
| 2,785,713 | Mar. 19, 1957 | L.R. Wagner | Power operated rotary end-thrust cutter | drill press accessories | |