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公开(公告)号：US2479755A
公开(公告)日：1949-08-23
申请号：US68803646
申请日：1946-08-02
Applicant: RADIO ELECTR SOC FR
Inventor： JEAN MARTIN
IPC: H01J5/28
CPC classification number: H01J5/28 , H01J2893/0044
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