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    • 2. 发明专利
    • NIGHT MAIN TELEPHONE SWTICHING SYSTEM
    • JPS54158107A
    • 1979-12-13
    • JP6736278
    • 1978-06-05
    • NIPPON ELECTRIC CO
    • FURUKAWA HISAO
    • H04M3/58H04Q3/58
    • PURPOSE:To secure the transfer from the night main telephone set to other extension telephone via the existing automatic transfer function and by providing the night main telephone switching circuit between the office trunk and the outgoing side of the main link and then using the office trunk. CONSTITUTION:Relay contact nt within night main telephone switching circuit unit NTSWU is inactive in the daytime, and thus night main telephone set A functions as a normal extension telephone set. At night contact not becomes active when the operator set the NT relay active, and telephone A is connected directly to office trunk COT via no main link LF. In case the operator of telephone A gives switching to extension telephone B, the channel completes between A and B via COT and the operation of automatic transfer link TFL, automatic transfer trunk TFT, automatic transfer register TFR and marker MK each. Then telephone B is connected to the station through operation of relay contact tfc.