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公开(公告)号：US3306983A
公开(公告)日：1967-02-28
申请号：US33200363
申请日：1963-12-20
Applicant: BELL TELEPHONE LABOR INC
Inventor： GOODWIN JAMES M , HAYES RICHARD L , LOOFBOURROW JOHN W
CPC classification number: H04M3/58 , H04Q3/0004
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