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Subscriber loudspeaker "Proletary" presumably since 1925 produced the Nizhny Novgorod radiotelephone plant named after Lenin in Kharkov, at an unidentified plant.
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"Proletary" was one of the first mass serial subscriber loudspeakers (loudspeakers) for the organization of wired network radio broadcasting in the USSR.
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The loudspeaker had a low sound volume due to its low sensitivity.
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