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公开(公告)号：US3348668A
公开(公告)日：1967-10-24
申请号：US48694865
申请日：1965-09-13
Applicant: SONY CORP
Inventor： HIDEO AMATSU , HANJIRO ESASHI
IPC: G03B21/32 , G11B23/027
CPC classification number: G11B23/027 , G03B21/323
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