| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| JJG 509-1987 | English | 279 |
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Days<=3
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Verification Regulation of Digit Industrial Frequency Meter Model PP27
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JJG 509-1987
| Obsolete |
JJG 509-1987
|