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公开(公告)号：US2990457A
公开(公告)日：1961-06-27
申请号：US71322658
申请日：1958-02-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： HALL ARTHUR D , ALFRED ZAROUNI
IPC: H04B3/20
CPC classification number: H04B3/20
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公开(公告)号：US2860258A
公开(公告)日：1958-11-11
申请号：US45677854
申请日：1954-09-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： HALL ARTHUR D
IPC: H03K23/54
CPC classification number: H03K23/54
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