Elektronika SP-01 (Supressor) 1987
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The suppressor "Electronics SP-01" was produced since 1987 by the Bryansk Plant of Semiconductor Devices. "Electronics СП-01" is a five-band notch filter and serves to suppress the electro-acoustic feedback of microphones and loudspeakers (whistle, background). ,null,ru,null,null,null,null
Information from collection of Valery Khartchenko