Testing methods for the resistance of machines, devices and other engineering products to external climatic influencing factors. Test for the action of humidity
Cable trunking and ducting systems for electrical installations. Part 2. Particular requirements. Section 1. Cable trunking and ducting systems intended for mounting on walls or ceilings
State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring volume densities of ionized air electric charge and air ion number concentration
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