Caption: Two vacuum tubes used for radio work during World War I. The McCullough tube and Donle tube (SUBIECT 67939 REC'D 3-26-20, TAKEN NUMBER PHOTOGRAPHER SIGNAL CORPS ). These vacuum tubes were crucial for transmitting and receiving radio signals during the war.

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Size: 8466px × 5659px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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