Koji Ishida

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Tokyo, JA

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Patents Grantslast 30 patents

Information Patent Grant
Method of writing and erasing information for electrooptic ceramic...
- Patent number 3,973,247
- Issue date Aug 3, 1976
- Hitachi, Ltd.
- Akio Kumada
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES