Explosionproof electrical apparatus. Part 12. Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents
Transformers for tubular discharge lamps having a no-load output voltage exceeding 1000 V (generally called neon-transformers). General and safety requirements
Corrosion of metals and alloys. Corrosivity of atmospheres. Methods for the determination of corrosion rate of standard specimens used for the evaluation of corrosivity
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