Fullerphone Mk IV- Secured field telegraphy set of British army. No
Lend-Lease supplies to the USSR. WHD = 280 х 165 х 170 mm,
weight (less battery) 5.4 kg.
Fullerphone was a special type of secured telegraphy set very popular in
British army since WW I when Captain Algernon Clement Fuller introduced the idea
of secured telegraphy over telephone lines using low level direct currents. Same
principles of secured telegraphy were in use during WW II, too. Our Fullerphone
was manufactured in 1943.
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