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Acoustic systems "Estonia 130AS-002" and "Estonia 130AS-003" since 1991 produced JSC "RET" mountains. Kohtla-Järve. Since the beginning of 1993, the Bryansk EMZ has produced the Soyuz 130AS-002 AS, similar to the AS - Estonia 130AS-002, except for the MF and HF level controls, in the ranges from 1 to 5 kHz and from 5 to 25 kHz, respectively, located at the back.