Chemical Warfare Service; Research Division conducted mechanical research on mask stoppers during World War I. This specific image showcases the position of the stopper when in service, with the pad and harness removed from the mask and fastened to a person's face. The photo was taken by Clark on July 12, 1918.

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Size: 8441px × 5741px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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