METHOD OF AND CONTROL CIRCUIT FOR CONNECTING A TARIFF COUNTING PULSE RECEIVER TO A TELEPHONE EXCHANGE TALKING CIRCUIT

• 1. 一种确定连接到公共无线付费电话上的通话期间发生的费用的方法和装置 [P] . 中国专利： CN1135823C . 2004.01.21
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• 3. CONTROL CIRCUIT FOR CONNECTING A TARIFF COUNTING PULSE RECEIVER TO A TELEPHONE EXCHANGE TALKING CIRCUIT [P] . PL150997B1 . 1990-07-31

  机译： 用于将关税计数脉冲接收器连接到电话交换通话电路的控制电路

• 4. Test circuit for call metering in telephone exchanges - monitors base-rate pulses and tariff-zone pulses using two sequences counted during call [P] . 德国专利： DE000001946804C3 . 1977-05-26

  机译： 电话交换机中呼叫计量的测试电路-使用呼叫期间计数的两个序列监视基本速率脉冲和资费区脉冲

• 5. Test circuit for call metering in telephone exchanges - monitors base-rate pulses and tariff-zone pulses using two sequences counted during call [P] . 德国专利： DE1946804B2 . 1976-10-14

  机译： 电话交换机中呼叫计量的测试电路-使用呼叫期间计数的两个序列监视基本速率脉冲和资费区脉冲

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