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Capsule microphone and telephone receiver since 1965 (possibly earlier) were produced by the Moscow plant No. 4 "Fizelektropribor".
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The kit is a tutorial for demonstrating the conversion of sound vibrations into electrical (carbon microphone battery) and, conversely, electrical vibrations into sound vibrations in a telephone receiver, with the microphone and the telephone receiver being spaced over a distance using wires.
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