
Acoustics - Hearing Protectors - Subjective Method For The Measurement Of Sound Attenuation
出版:Swiss Standards

專家解讀視頻
1993
ISO 4869-1:1990 - Identical
NF EN 24869-1:1993 - Identical
DIN ISO 4869-1 (1991-10) - Identical
DIN ISO 4869-1 : 1991 - Corresponds
DIN ISO 4869-1 : 1991 - Identical