"Inside view of the first French mask made in the with the first form of breathing valve, designed by Dr. Gibbs in the Chemical Warfare Service's Research Division. This photograph was taken on July 12, 1918, and received from the Chemical Warfare Service. Photographer's notes describe the mechanical research conducted by Fogler."

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

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