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公开(公告)号：US2973787A
公开(公告)日：1961-03-07
申请号：US61378156
申请日：1956-10-03
Applicant: INT STANDARD ELECTRIC CORP
Inventor： PERCY THWAITES GEORGE , HAROLD DOWNING
IPC: H01J19/00
CPC classification number: H01J19/00 , H01J2893/0025
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