HD 450.4:1984被替代
Hearing Aids - Magnetic Field Strength In Audio Frequency Induction Loops For Hearing Aid Purposes
出版：Harmonization Documents
专家解读视频
S1 [11/09/1984]
SS IEC 118:1986 - Identical
UNE 20603-4:1982 - Similar
BS 6083-4:1981 - Equivalent
NFC 97 610:1986 - Identical
IEC 60118-4 Ed. 2.0 - Similar
DIN IEC 60118-4 (1991-11) - Identical
CEI 29-11 Ed. 1 (1998) - Identical
