IEC 60126:1961/COR1:1965 Corrigendum 1 - IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts
1973IEC 60126:1973 IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts
1970IEC 60126:1961/COR1:1965 Corrigendum 1 - IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts
1970IEC 60126:1961 IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts