The image shows Clark conducting mechanical research for the Chemical Warfare Service's Research Division. He is working on the G-76 smoke filter, which is used in conjunction with the canister SURVECT. The photo was taken on July 12, 1918, and its unique ID is 1055. This information is documented by the Chemical Warfare Service.

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Size: 8484px × 5809px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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