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GB/T 5444-1985 The test methods for The technical specifications of subscriber line signalling for automatic telephone switching network 电话自动交换网用户信号技术指标测试方法 - 英文版 |
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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/T 5442-1985 The test methods for The technical specifications of inband pulsing single frequency line signalling system for automatic telephone switching network 电话自动交换网带内单频脉冲线路信号技术指标测试方法 - 英文版 |
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GB/T 4653-1984 The general technical specifications on infrared radiation paints 红外辐射涂料通用技术条件 - 英文版 |
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GB/T 3971.3-1983 The test methods for The technical specifications of multi-frequency register signalling for telephone auto-matic switching network 电话自动交换网多频记发器信号技术指标测试方法 - 英文版 |
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