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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| SJ 20561-1995 |
General specification for military subscribers access node switchboards 军用光纤通信术语 |
China Electronics
Standards switchboards |
 English PDF |
| SJ/T 10559-1994 |
Type designation system for telephone switchboards 电话交换机型号命名方法 |
China Electronics
Standards switchboards |
English PDF |
| YD/T 638.5-1993 |
Type designation system for telephone switchboards 电话交换机型号命名方法 |
China Telecommunication
Standards switchboards |
English PDF |
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