Electrical apparatus for use in the presence of combustible dust. Part 1. Electrical apparatus protected by enclosures and surface temperature limitation. Section 1. Specification for apparatus
State system for ensuring the uniformity of measurements. State verification scheme for instruments measuring the heat flux surface density in the range from 1 to 10000 W/m2
Occupational safety standards system. Noise. Determination of noise characteristics of noise sources in a free-field over reflecting plane. Engineering method
