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GB/T 5443-1985 The test methods for the technical specifications of Ringing and tone for automatic telephone switchingnetwork 电话自动交换网铃流和信号音技术指标测试方法 - 英文版 |
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GB 3380-1982 Ringing and tone for telephone automatic switching network 电话自动交换网铃流和信号音 - 英文版 |
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