Image of an American standard box respirator mask displaying an upgraded nose clip and spring mechanism. This photo was taken by a photographer from the Chemical Warfare Service on April 2, 1919. The image is labeled as part of the "Subiect56732 Number AU" collection, with accompanying notes numbered #457.

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Size: 8494px × 5824px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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