Mathias A. Klinger

Mathias A. Klinger was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.

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Helene Smith was a laboratory technician in the Health Division at the Metallurgical Laboratory in Chicago during the Manhattan Project.

Stanley Hall (1924 – present) is an American laboratory technician and scientist who worked on the Manhattan Project at Los Alamos, New Mexico.