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公开(公告)号：US2264393A
公开(公告)日：1941-12-02
申请号：US36224840
申请日：1940-10-22
Applicant: BELL TELEPHONE LABOR INC
Inventor： MCCURDY RALPH G , DOREN MITCHELL
IPC: H04B3/54
CPC classification number: H04B3/544
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