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公开(公告)号：US2447495A
公开(公告)日：1948-08-24
申请号：US48627543
申请日：1943-05-08
Applicant: INT STANDARD ELECTRIC CORP
Inventor： DEN HERTOG MARTINUS , CABES LUCIEN ALFRED B
IPC: H04Q1/18
CPC classification number: H04Q1/18
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