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公开(公告)号：US1628987A
公开(公告)日：1927-05-17
申请号：US41258720
申请日：1920-09-24
Applicant: WESTERN ELECTRIC CO
Inventor： KING ROBERT W
CPC classification number: H01J7/186 , H01J19/28 , H01J2893/0013
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