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    • 2. 发明授权
    • Telephone system with multiple extension telephones
    • 带多个分机电话的电话系统
    • US5090052A
    • 1992-02-18
    • US683085
    • 1991-04-09
    • Ryuichi NakajimaKoji Yamana
    • Ryuichi NakajimaKoji Yamana
    • H04M1/723H04M9/00H04M9/02
    • H04M1/723H04M9/005H04M9/027
    • An improved telephone system in which a plurality of telephone units connected to a common telephone line is directly connected to an outside telephone line. Each telephone unit contains complete capability for making outside calls, for making extension calls, and for the automatic exchange control of the use of the common telephone line. This telephone system provides functions, including making multiple simultaneous calls on a single telephone line without requiring separate exchange equipment, additional extension or signal lines, or any sacrifice in signal quality. Furthermore, the telephone units in this system can be connected to more than one outside telephone line to expand the system capacity.
    • 一种改进的电话系统,其中连接到公共电话线的多个电话单元直接连接到外部电话线。 每个电话单元包含完成外拨呼叫,拨打电话以及自动交换控制公用电话线路使用的能力。 该电话系统提供功能,包括在单个电话线路上进行多个同时呼叫,而不需要单独的交换设备,附加分机或信号线,或任何牺牲信号质量。 此外,该系统中的电话单元可以连接到多个外部电话线路,以扩大系统容量。