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公开(公告)号：US1567260A
公开(公告)日：1925-12-29
申请号：US62591123
申请日：1923-03-17
Applicant: FOREST RADIO TELEPHONE & TELEG
Inventor： WILLIAM GARITY
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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