![](http://www.alamy.com/thumbs/6/BBD57B36-8DE9-4A68-B23F-D8FE2C22FD57/2RC1MG9.jpg)
This photograph taken on February 21, 1918, features a radio apparatus with the designation VT-1. The device is of the vacuum tube type and was commonly used by the military during World War One. The symbol "A 9 *05071" indicates the official identification code associated with the equipment.
Size: 9182px × 6303px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No
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