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* ISO 9613-1 — ''Acoustics — Attenuation of sound during propagation outdoors'' | * ISO 9613-1 — ''Acoustics — Attenuation of sound during propagation outdoors'' | ||
* ISO 11654 — ''Acoustics — Sound absorbers for use in buildings — Rating of sound absorption'' | * ISO 11654 — ''Acoustics — Sound absorbers for use in buildings — Rating of sound absorption'' | ||