This photograph showcases a piece of radio signal corps apparatus from World War I. The issued symbol for this particular component is ATJ. It features an inductance coil used in the transmitting hookup. The accompanying notes mention various numerical values and readings related to the apparatus.

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Size: 8581px × 5748px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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