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Gully devices, gullies, backflow devices and air admittance valves for use inside buildings (CEN/TC 165/WG 11)

Electroacoustics - Audiometric equipment - Part 5: Instruments for the measurement of aural acoustic impedance/admittance

Electroacoustics - Audiometric equipment - Part 5: Instruments for the measurement of aural acoustic impedance/admittance

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