China 'GB/T 3971.3-1983
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
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
Issued Date:1983-12-15
Implemented Date:1984-10-01
Issued by:
The Standardization Administration of the People's Republic of China
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