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公开(公告)号：US2416330A
公开(公告)日：1947-02-25
申请号：US54985444
申请日：1944-08-07
Applicant: STANDARD TELEPHONES CABLES LTD
Inventor： EMILE LABIN , GRIEG DONALD D
IPC: H04J3/04
CPC classification number: H04J3/042
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