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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| JJG 508-2004 |
Verification Regulation of Resistivity Measuring Instruments with Four-Probe Array Method 四探针电阻率测试仪检定规程 |
China Metrological
Standards Verification Regulation Four |
 English PDF |
| JJG 373-1997 |
Verification Regulation of Four-ball Friction Testing Machine 四球磨擦试验机检定规程 |
China Metrological
Standards Verification Regulation Four |
English PDF |
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