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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| JJF 065-2009 |
A DTM type digital milliseconds calibration specification |
China Metrological
Standards DTM |
 English PDF |
| DL/T 888-2004 |
Electric power system dispatching exchange specification of DTMF signalling 电力调度交换机电力DTMF信令规范 |
China Electricity & Power
Standards DTM |
English PDF |
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