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公开(公告)号：US1769902A
公开(公告)日：1930-07-01
申请号：US23137427
申请日：1927-11-05
Applicant: FED TELEGRAPH CO
Inventor： SUMMERS HARRY A , SOLLIE SIGURD A
IPC: H04R11/08
CPC classification number: H04R11/08
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