Daisuke Horiuchi

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Gradient density filter medium
- Patent number 4,793,923
- Issue date Dec 27, 1988
- Toyo Roki Seizo K.K.
- Teruichi Kadoya
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL