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.

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Size: 9182px × 6303px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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