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1.发明授权Equipment for selectively establishing audio and wideband communication paths through two autonomous switching systems 失效通过两台自动切换系统选择性地建立音频和宽带通信系统的设备
公开(公告)号：US3612767A
公开(公告)日：1971-10-12
申请号：US3612767D
申请日：1969-06-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： ANDERSON HAROLD P , BECKER FLOYD K , BERRYMAN ROBERT D , BOTSFORD NELSON JR , HOFFMAN MAURICE A , RYAN ARTHUR P
Abstract: Independently operated switching systems which are actuated on every call are disclosed for establishing via one system audioonly communication paths and via the other system wideband as well as audio communication paths. Initially, both systems are connected on a call and one of them is released by the caller for determining the particular switching system and therefore the necessary switching facilities to be utilized on the call.
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公开(公告)号：US3530254A
公开(公告)日：1970-09-22
申请号：US3530254D
申请日：1968-08-01
Applicant: BELL TELEPHONE LABOR INC
Inventor： BERRYMAN ROBERT D , MCEOWEN JAMES R , SALTUS GEORGE E
IPC: H04M3/56
CPC classification number: H04M3/56
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