
Magnetic Field Strength In Audio-frequency Induction Loops For Hearing Aid Purposes
出版:Asociacion Espanola de Normalizacion

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82 [15/10/1982]
IEC 60118-4 Ed. 2.0 - Identical
HD 450.3:1984 - Identical
HD 450.4:1984 - Similar
HD 450.3 : 200S1 - Identical
IEC 60118-4 : 3.1 - Identical
HD 450.4 : 200S1 - Similar to