ACUSTICA. PROTECTORES AUDITIVOS CONTRA EL RUIDO. PARTE 1: METODO SUJETIVO DE MEDIDA DE LA ATENUACION ACUSTICA.
ACOUSTICS. HEARING PROTECTORS. PART 1: SUBJECTIVE METHOD FOR THE MEASUREMENT OF SOUND ATTENUATION.
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CTN 74 - Acoustics
ISO 4869-1:1990 (Identical)
It is cancelled by: UNE-EN 24869-1:1994
