IEC: 79 - 12 - 1978; Electrical apparatus for explosive gas atmospheres Part 12 Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents

IEC: 79 - 12 - 1978; Electrical apparatus for explosive gas atmospheres Part 12 Classification of mixtures of gases or vapours with air according to their maximum experimental safe gaps and minimum igniting currents - Geneva IEC 1978 - 18p

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