Yoshihiko Ohama

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Hiyoshi, Kohoku-ku, Yokohama-shi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Grain for construction material
- Patent number 4,759,988
- Issue date Jul 26, 1988
- Tohoku Electric Power Company, Inc.
- Tadashi Yamamoto
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES