Hirokazu Norma

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Ibaraki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for the improvement of a gramophone record
- Patent number 4,307,045
- Issue date Dec 22, 1981
- Shin-Etsu Chemical Co.
- Kiyoshi Imada
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL