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公开(公告)号：US2423077A
公开(公告)日：1947-07-01
申请号：US47388443
申请日：1943-01-28
Applicant: INT STANDARD ELECTRIC CORP
Inventor： DE VRIENDT CHARLES , DE ZEEUW CONSTANT
IPC: H04Q9/04
CPC classification number: H04Q9/04
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