State system for ensuring the uniformity of measurements. State verification schedule for means measuring the airborne sound pressure in the frequency range 2 Hr -100 kHr
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State system for ensuring the uniformity of measurements. State verification schedule for means of measuring the ultrasound power in water within the frequency range from 0,5 to 12 MHz
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State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring of sound velocity in liquids within the velocity range 800 to 2000 m/s
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