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公开(公告)号：US2911150A
公开(公告)日：1959-11-03
申请号：US62478456
申请日：1956-11-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： GEORGE RIGGS , SCHUNNEMAN ROBERT F
IPC: H04M15/38
CPC classification number: H04M15/38
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