China National Standards

China Multifrequency register signalling GB Standards List

  •  China "Multifrequency register signalling" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB 3377-1982 Multifrequency register signalling system for telephone automatic switching network
    电话自动交换网多频记发器信号方式    		 China National Standards
    Multifrequency register signalling
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