"Signalling Through The Ages" At Radio Exhibition - Part of the Army's exhibit in the show, "Signalling thorough she ages", Cpl. Fulkner (left) of the Royal Signals, with the latest type Infantry 2-way radio-telephone, chats with S.Q.M.S. Oates who is demonstrating a single needle telegraph dating back to 1857, as used by the Army in the Korean War. The latest development in radio and television are to be seen at the National Radio Exhibition which opened at Earls Court today. August 28, 1951. (Photo by Fox Photos).