EN 60118-4:1998 Hearing Aids Part 4: Magnetic Field Strength in Audio-Frequency Induction Loops for Hearing Aid Purposes (Incorporates Amendment A1: 1998)
2015EN 60118-4:2015 Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes - System performance requirements
2006EN 60118-4:2006 Electroacoustics - Hearing aids Part 4: Induction loop systems for hearing aid purposes - Magnetic field strength
1998EN 60118-4:1998 Hearing Aids Part 4: Magnetic Field Strength in Audio-Frequency Induction Loops for Hearing Aid Purposes (Incorporates Amendment A1: 1998)