Patent search ap:("BELL TELEPHONE LABOR INC") AND inv:"BEAN HENRY S" Page 1

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发明授权
Busy line call transfer system 失效
Title translation: 忙线呼叫转接系统

公开(公告)号：US3278692A

公开(公告)日：1966-10-11

申请号：US30036963

申请日：1963-08-06

Applicant: BELL TELEPHONE LABOR INC

Inventor： BEAN HENRY S , BURNS THOMAS V , HAYES RICHARD L , MILTON KLEIN

IPC: H04Q3/54

CPC classification number: H04Q3/54

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