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DIN ETS 300581-4
European digital cellular telecommunications system - Half rate speech - Part 4: Comfort noise aspects for the half rate speech traffic channel; English version ETS 300581-4:1995
Edition
1996-07
DIN EN ISO 11654
Acoustics - Sound absorbers for use in buildings - Rating of sound absorption (ISO 11654:1997); German version EN ISO 11654:1997
Edition
1997-07
