World War One: An image of a disassembled Type Dreyer oxygen mask used by aviators, received from the Signal Corps. This photo was taken on December 18, 1918, and is not intended for publication but for official use only. Notes indicate the mask's purpose and its restrictions on usage.

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Size: 8341px × 5620px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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