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| All Patents in class 175/333 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,253,015 | Jan. 08, 1918 | D.L. Driscoll | Combination Overshot Rotary Milling Cutter | milling machine cutters | |
| 1,254,268 | Jan. 22, 1918 | R.O. Pickin | Core Drill | ||