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621.395.6 --- 534.86 --- Telephone apparatus --- Sound transmission (radio, television, film). Electroacoustics --- Elektro-akoestiek --- Elektro-akoestiek. --- 534.86 Sound transmission (radio, television, film). Electroacoustics --- 621.395.6 Telephone apparatus --- Technologie --- Media --- Architectuur --- Fysica --- Akoestiek --- Elektroakoestiek --- 20e eeuw