Military field telephone, Bakelite case.
Used by the Soviet military from 1957. Used by the Warsaw Pact countries and the Arab countries from late 1950s, designated TA-57
Used with local battery (10 Volts Lead-Acid battery).
Includes bell (ringer) and hand cranked dynamo (~70 Volts, 15 to 45 Hz).
Used also for remote control of radio stations.
Weight: 2.8 Kg.
Technology: transistor amplifier.
