Blok indikacii 1990
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Radio module "Display Unit" has been produced presumably since 1990. There is no certainty that this is a factory RK, possibly a cooperative one. Since the 90s who just did not release. The RC is intended for assembling a block of indication of the playback level (recording) for tape recorders, as well as amplifiers and other household equipment.
Documentation:
Information from collection of Valery Khartchenko