The photograph shows the inlet and exit manifolds for compressors at the Haber synthetic ammonia catalyst testing plant located at the American University in Washington The photo was taken on February 4, 1920, by photographer Hitz. The image is labeled with the symbol 189UED A.

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Size: 8457px × 5781px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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