"N1 " CNS Standards List |
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CNS 4121
2017 Edition Type N1 standard test block for ultrasonic normal beam testing of steel plates 超音波檢測鋼板用N1型標準規塊 |
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CNS 4121
1998 Edition Type N1 standard test block for ultrasonic normal beam testing of steel plates 超音波檢測鋼板用N1型標準規塊 |
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