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HG 20530-1992
Chinese Standard: 'HG 20530-1992'
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HG 20530-1992
English
259
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Steel pipe flanges for welding lip seal ring
HG 20530-1992
HG 20530-1992
SIMILAR
Google-Books for your assessment (Full-PDF of
HG 20530-1992_English
needs to be translated from scratch):
GB/T 25156-2020
HG/T 5459-2018
HG/T 3247-2017