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Hiroyuki Ichikawa
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Takarazuka, JP
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last 30 patents
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Patent Grant
Collimator lens
Patent number
4,693,565
Issue date
Sep 15, 1987
Nippon Sheet Glass Co., Ltd.
Hiroyuki Ichikawa
G02 - OPTICS
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Patent Grant
Optical information recording/reproducing element
Patent number
4,643,535
Issue date
Feb 17, 1987
Nippon Sheet Glass Co., Ltd.
Hiroyuki Ichikawa
G02 - OPTICS