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公开(公告)号：US2771509A
公开(公告)日：1956-11-20
申请号：US35706253
申请日：1953-05-25
Applicant: BELL TELEPHONE LABOR INC
Inventor： DUDLEY HOMER W , HARRIS CYRIL M
IPC: G10L13/06
CPC classification number: G10L13/07
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