Fumiaki Hanawa

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Kitaibaraki, JA

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Patents Grantslast 30 patents

Information Patent Grant
Continuous optical fiber preform fabrication method
- Patent number 4,062,665
- Issue date Dec 13, 1977
- Nippon Telegraph and Telephone Public Corporation
- Tatsuo Izawa
- C03 - GLASS MINERAL OR SLAG WOOL