Shigeru Matumoto

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Key-board switch unit
- Patent number 4,302,648
- Issue date Nov 24, 1981
- Shin-Etsu Polymer Co., Ltd.
- Ryoichi Sado
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL