Mobiles

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In Europe, radio telephony was first used on the first-class passenger trains between Berlin and hamburg in 1926. At the same time, radio telephony was introduced on passenger airplanes for air traffic security. Later radio telephony was introduced on a large scale in German tanks during the second world war. After the war German police in the British zone of occupation first used surplus tank telephony equipment to run radio patrol cars. [citation needed] in all of these cases the service was confined to specialists that were trained to use the equipment. In the early 1950s ships on the Rhine were among the first to use radio telephony with an untrained end customer as a user. However it was the 1940s onwards that saw the seeds of technological development which would eventually produce the mobile phone that we know today. Motorola developed a backpacked two-way radio, the walkie-talkie and a large hand-held two-way radio for the us military. This battery powered "handie-talkie" (ht) was about the size of a mans forearm. In 1946 in st. Louis, the mobile telephone service was introduced. Only three radio channels were available, and call set-up required manual operation by a mobile operator. Also that year, soviet engineers g. Shapiro and i. Zaharchenko successfully tested their version of a radio mobile phone mounted inside a car. This device could connect to local telephone network with a range of up to 20 kilometers. [citation needed]