Circular 20/2011/TT-BLDTBXH dated July 29, 2011 promulgating the National Technical Regulation on safe work for electric welding & welding jobs.
The Circular issues the National Technical Regulation on safe work for electric welding & welding jobs: QCVN 03: 2011/BLDTBXH
The Circular takes effective since November 12, 2011
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