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Database: 189760 (25 Oct 2025)
MT/T 789-1998
Chinese Standard: 'MT/T 789-1998'
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MT/T 789-1998
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Days<=4
Diamond core bit for coal drilling
MT/T 789-1998
Obsolete
MT/T 789-1998
SIMILAR
unprotected-true-PDFs:
MT/T 716-2019
MT/T 668-2019
GB/T 18487.2-2017