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公开(公告)号：US3340421A
公开(公告)日：1967-09-05
申请号：US38634964
申请日：1964-07-30
Applicant: SONY CORP
Inventor： YASUMITSU WATANABE , TAKUJI INOUE
CPC classification number: H01J31/201 , H01J29/28 , H01J29/32
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