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Database: 189760 (25 Oct 2025)
MT 646-1997
Chinese Standard: 'MT 646-1997'
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Contents [version]
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Related Standard
MT 646-1997
English
399
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Days<=3
Frictional metal prop
MT 646-1997
Obsolete
MT 646-1997
SIMILAR
unprotected-true-PDFs:
GB 25974.3-2010
MT 76-2011
GB/T 4652-2021