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The subscriber loudspeaker "0.5 GD II-1" has been produced presumably since 1952 by the Volodarsky Ulyanovsk Machine-Building Plant.
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AG was produced in several versions.
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Prior to that, a similar subscriber loudspeaker named "ZIK" (GDM-0.5) was produced by the Leningrad Plant named after Kalinin, which at the end of 1951 transferred production to the city of Ulyanovsk.
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Presumably in the fall of 1953 the Ulyanovsk Machine-Building Plant named after Volodarsky switched to the production of AG "Volga".
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