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公开(公告)号：US2272927A
公开(公告)日：1942-02-10
申请号：US23004438
申请日：1938-09-15
Applicant: WESTERN ELECTRIC CO
Inventor： STAGER LUKE L
IPC: H01J5/24
CPC classification number: H01J5/24 , H01J2893/0039
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