
Acoustics; Hearing Protectors; Subjective Method For The Measurement Of Sound Attenuation
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專(zhuān)家解讀視頻
91 [01/10/1991]
ISO 4869-1:1990 - Identical
SNV DIN ISO 4869-1:1991 - Identical
SNV NF EN 24869-1:1993 - Identical