Kyokuwei Optical Glass Co., Ltd.

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Fabrication method for chamfered hole
- Patent number 4,800,686
- Issue date Jan 31, 1989
- Kyokuwei Optical Glass Co., Ltd.
- Toshihiko Hirabayashi
- B28 - WORKING CEMENT, CLAY, OR STONE