Transmission of audio and/or video and related signals using infra-red radiation. Part 3. Transmission systems for audio signals for conference and similar systems
Occupational safety standards system. Special foot-wear, personal means of hands protection, special protective clothes and materials for their manufacture. Method for determination of petroleum and petroleum products penetration
State system for ensuring the uniformity of measurements. Measurement of energy and the effective characteristics ultraviolet radiation germicidal irradiators. Procedure of measurements
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