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公开(公告)号：US3268759A
公开(公告)日：1966-08-23
申请号：US28680463
申请日：1963-06-10
Applicant: HITACHI LTD
Inventor： YOSHIHISA MINAMIKAWA , SHINJIRO KATAGIRI
IPC: H01J3/02
CPC classification number: H01J3/028 , Y10T29/53552
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