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公开(公告)号：US2004605A
公开(公告)日：1935-06-11
申请号：US66932033
申请日：1933-05-04
Applicant: WESTERN ELECTRIC CO
Inventor： GOODCHILD FRANK D , BENHAM WILFRID E
IPC: H01J19/42
CPC classification number: H01J19/42 , H01J2893/0002
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