| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 4770.1-1984 | English | 919 |
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Days<=6
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The test methods for 3-channel open wire carrier telephone equipment
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GB/T 4770.1-1984
| Obsolete |
GB/T 4770.1-1984
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