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| Patents for Tatsuo Arai | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,240,356 | Aug. 31, 1993 | T. Saito, T. Arai | Nitrided Cutter Machining | insert tool holders | |
| 5,352,067 | Oct. 04, 1994 | T. Saito, T. Arai | Milling Cutter Clamping Wedge with Hardened Chip Surface | insert tool holders | |