| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| TB/T 1692-1993 | English | 669 |
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Days<=4
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Railway Telephone Switching Network - Multi-frequency Coding Register Signalling
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TB/T 1692-1993
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TB/T 1692-1993
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