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