Antibacterial NANO face masks - last 500 pcs

 

 

17.140.99 Other standards related to acoustics

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Released: 1997-10-15
BS EN ISO 11821:1997
Acoustics. Measurement of the in situ sound attenuation of a removable screen
LANGUAGE
English
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Released: 1998-12-15
BS EN ISO 14163:1998
Acoustics. Guidelines for noise control by silencers
LANGUAGE
English