arrangement for checking and analysis of characteristics on telephone lines, preferably for semi-automatic wake subscribers in telephone

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  机译： 电信中用户线和用户站的中央阻塞的装置，最好是电话系统

• 4. Means for the central jam of subscriber lines and subscriber stations, in telecommunications -, preferably telephone systems [P] . 德国专利： DE1909153B2 . 1974-10-31

  机译： 电信中用户线和用户站的中央阻塞的装置，最好是电话系统

• 5. Means for the central jam of subscriber lines and subscriber stations, in telecommunications -, preferably telephone systems [P] . 德国专利： DE1909153A1 . 1970-09-10

  机译： 电信中用户线和用户站的中央阻塞的装置，最好是电话系统

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