Caption: "Buzzerphone, Type EE, photographed by Lt. Drucker, on June 24, 1918 for the Research & Inspection Division in Paris, France. This new model was used for classified communication purposes during World War One. Not for public distribution, for official use only."

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Size: 8460px × 5696px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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