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YD 251-1981
Chinese Standard: 'YD 251-1981'
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YD 251-1981
English
199
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Days<=2
(Pull the collar)
YD 251-1981
Obsolete
YD 251-1981
SIMILAR
Google-Books for your assessment (Full-PDF of
YD 251-1981_English
needs to be translated from scratch):
GB/T 3873-1983
YD/T 3707-2020
YD/T 3708-2020