| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 5581-1985 | English | 279 |
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Days<=3
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Specification and measuring method of frequency-modulated voice-frequency telegraph set for a modulation rate of 75 Bauds with channels spaced at 180 Hz
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GB/T 5581-1985
| Obsolete |
GB/T 5581-1985
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