ELECTRONIC EQUIPMENT OF SUBSCRIBER, CONVERSION CIRCUIT TWO THREE-FOUR SON, FOR TELEPHONE CENTRAL.

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  机译： 用于电话交换的两线到四线转换的用户电话电路的电子设备

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  机译： 具有两芯线的四线转换电路用户电话设备，用于电话交换

• 5. Subscriber's electronic line equipment comprising a two-wire-four- wire conversion circuit for a telephone exchange [P] . 美国专利： US4302636A . 1981-11-24

  机译： 用户的电子线路设备，包括用于电话交换机的两线四线转换电路

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