Yoshiyuki Oka

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Patents Grantslast 30 patents

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Coagulant for soil and/or sand method for preventing washout using...
- Patent number 5,006,176
- Issue date Apr 9, 1991
- Sejima; Shiro
- Yoshiyuki Oka
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES