Military field telephone.
Used by the UK military from 1941 until late 1960s.
Used by the Haganah Signal Service. Used by the IDF during the War of Independence (1948).
Used with local battery (two 1.5 Volts BU-30 cells).
Includes bell (ringer) and hand cranked dynamo (~70 Volts, 17 Hz).
Operates on LB (Local Battery) and CB (Central Battery) lines.
