improvements made to a group of bodies in the core.

摘要

Telephone automatic switching unit for semi-public use, serving private subscribers and permitting communication by at least a portion of the subscribers via the public communication network by either direct connection of the network, or by means of operators, the subscribers being associated with either one or several different enterprises. The automatic switching unit includes a connecting network, a central control member or a processing unit, registers, senders, and incoming and outgoing circuits for providing communication between subscribers as well as connection with the public network.