1966IEC 60225:1966 Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations
IEC 60225:1966 Octave, half-octave and third-octave band filters intended for the analysis of sounds and vibrations was changed to IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters.