Shigeru Sugiyama

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Fuji, JP

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Patents Grantslast 30 patents

Information Patent Grant
Light shielding screen structure and a process for producing the same
- Patent number 4,877,308
- Issue date Oct 31, 1989
- Asahi Kasei Kogyo Kabushiki Kaisha
- Osamu Okuno
- G02 - OPTICS