Antibacterial NANO face masks
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ICS codes
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17 METROLOGY AND MEASUREMENT. PHYSICAL PHENOMENA
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17.140 Acoustics and acoustic measurements
17.140.01 Acoustic measurements and noise abatement in general
17.140.20 Noise emitted by machines and equipment
17.140.30 Noise emitted by means of transport
17.140.50 Electroacoustics
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