Bulgarian Institute for Standardization
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БДС 3971-11:1991

Jan 1, 1991

General information

90.93     Mar 6, 2023

BDS

ТК-64

Pure national standard

29.220.20  

Bulgarian  

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БДС 3973:1969

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БДС 3971-11:1991
90.93 Standard confirmed
Mar 6, 2023