Field Telephone
Telephone, Telephone exchange, Battery (electricity), Common battery
978-620-0-22632-7
6200226326
96
2012-01-04
34,00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Field telephones are mobile telephones intended for military use, designed to withstand wartime conditions. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones. Field telephones were first used in the First World War to direct troops. They replaced flag signals and the telegraph as an efficient means of communication.
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Elektronika, elektrotechnika, kommunikációs technológia
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