| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 3971.3-1983 | English | 319 |
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The test methods for the technical specifications of multi-frequency register signaling for telephone automatic switching network
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GB/T 3971.3-1983
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GB/T 3971.3-1983
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