State system for ensuring the uniformity of measurements. Measuring instruments of direct current in the range from 1•10-15 to 1•10-9A. Verification procedure
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 1. Reference equivalent threshold sound pressure levels of pure tones for supra-aural earphones
Medical equipment. General requirements to methods for determination of mechanical and thermal fields safe indices for medical ultrasonic diagnostic equipment
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