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Priority to JP3867489UpriorityCriticalpatent/JPH0621049Y2/ja
Publication of JPH02132316UpublicationCriticalpatent/JPH02132316U/ja
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Publication of JPH0621049Y2publicationCriticalpatent/JPH0621049Y2/ja
Light-pickup device applied to a recording and/or reproduction device for an optical disk inluding a detection circuit that generates a focus zero cross signal