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The radio battery "BCh-Z" since 1930 was produced at the Moscow Electromechanical Plant and at the Leningrad Kozitsky Hardware Plant. The radio receiver is assembled with four radio tubes and coincides in parameters with the radio receiver "warhead", differing in a closed case and mounting changes. The abbreviation "BCH-W" is deciphered: Borusevich (after the first letter of the developer's last name), Four-lamp, Closed type. To improve the sensitivity and selectivity of the receiver produced a special filter.