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公开(公告)号：US1830935A
公开(公告)日：1931-11-10
申请号：US37067329
申请日：1929-06-13
Applicant: INT STANDARD ELECTRIC CORP
Inventor： GERALD DEAKIN , LIPA POLINKOWSKY
IPC: H04Q3/42
CPC classification number: H04Q3/42
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