| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 638.12-1993 | English | 279 |
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Days<=3
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Type designation for communications measuring instruments
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YD/T 638.12-1993
| Obsolete |
YD/T 638.12-1993
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