The system of ensuring the uniformity of measurements at the enterprises of the aviation industry. Metrological assurance of the products of aviation technology
Occupational safety standards system. Respiratory protective devices. Valved filtering half masks to protect against gases and particles. General specifications
State system for ensuring the uniformity of measurements. Acoustics. Reference zero for the calibration of audiometric equipment. Part 7. Reference threshold of hearing under free-field and diffuse-field listening conditions
€10
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