Switching apparatus for use in a paging system of

专利名称：Switching apparatus for use in a paging

system of a key telephone system

发明人：SHINOI; TSUYOSHI,TSUTSUMI;

FUMIO,KERMAN; STEPHEN E.

申请号：US34813073申请日：19730405公开号：US3872261A公开日：19750318

摘要：Switching apparatus for use in a paging system of a key telephone system isdisclosed by which voice paging signals, central office arrival signals and other signals canbe transmitted to multiple internal zones, made up of a plurality of key telephoneshaving internal amplifiers and speakers. Additionally both voice paging signals and atleast one other signal can be transmitted to multiple external zones comprising speakersonly. By the proper selection of connections various combinations of internal andexternal zones are possible.

申请人：NIPPON TSU SHIN KOGYO K.K.

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