technics, microphones, cristal microphone (Duroplast / Bakelit), RFT sign, GDR, 1950s,

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Photo credit: © INTERFOTO / History / Alamy / Afripics
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Keywords: 20th, 50s, audio, bakelit, century, cristal, ddr, duroplast, east, east-germany, electronics, gdr, germany, historic, historical, microphone, microphones, rft, sign, sound, technic, technics