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IEC 60268-4:1972 ed1.0

Заменен
Sound system equipment. Part 4: Microphones. — 71 стр.
Applies to sound system microphones in both professional and domestic applications. Specifies the essential characteristics and the relevant measuring methods.
ICS
33.160.50 Auxiliaries. Including headphones, loudspeakers, microphones, etc. / Вспомогательные устройства. Включая наушники, громкоговорители, микрофоны и т.д.