Osamu Isogai

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Ichihara, JA

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Patents Grantslast 30 patents

Information Patent Grant
Pencils not requiring sharpening
- Patent number 4,019,822
- Issue date Apr 26, 1977
- Idemitsu, Kosan Kabushiki-Kaisha (Idemitsu Kosan Co., Ltd.)
- Takeshi Matsumoto
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES