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公开(公告)号：US3439330A
公开(公告)日：1969-04-15
申请号：US3439330D
申请日：1965-06-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： SIPRESS JACK M , ZARINS EGILS
CPC classification number: H04L1/247 , H04L25/4925
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