Hearing aids; part 0: measurement of electroacoustical characteristics (IEC 60118-0:1983 + IEC 118-0 AMD 1:1994); German version EN 60118-0:1993 + A1:1994— 15 стр.
Hearing aids - Part 2: Hearing aids with automatic gain control circuits (IEC 60118-2:1983 + A1:1993 + A2:1997); German version EN 60118-2:1995 + A2:1997— 14 стр.