GLYN GOODWIN / SCIENCE PHOTO LIBRARY GLYN GOODWIN / SCIENCE PHOTO LIBRARY
Early portable military radio. Artwork of a soldier carrying an early portable military radio. Radios used by the military varied in size depending on how far they needed to transmit and receive. It was not until the invention of the transistor and its practical use from 1954 that radios could be greatly reduced in size, making them more portable.
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