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公开(公告)号：US3518572A
公开(公告)日：1970-06-30
申请号：US3518572D
申请日：1968-07-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： RAO TADIKONDA N
CPC classification number: H04M1/50 , H03B5/24 , H03B5/26 , H03B2201/0283
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