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公开(公告)号：US3013176A
公开(公告)日：1961-12-12
申请号：US653760
申请日：1960-02-03
Applicant: INT STANDARD ELECTRIC CORP
Inventor： GEORGE FIELD ANDREW
IPC: H01J19/30
CPC classification number: H01J19/30 , H01J2893/002
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