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Johns Hopkins University Gas Engineering Lab etching
Copied from information provided by donor: Etching made by Susan Walton Kemp (1918 - 2002) for her fiance Joseph Burnham Gray (1915-1998) who was a chemical engineering graduate student at Johns Hopkins, completing his PhD in June 1941. Although he did not invent Lyrica (spandex), he helped develop the mixing process for it while working for DuPont.
Processing note: The Gas Engineering Building later became the office of the Johns Hopkins University News-letter.