In 1935, while working for B. F. Goodrich and searching for a synthetic rubber, a chemical engineer named Waldo Lonsbery Semon developed a rubber-like plastic that was technically termed vinyl chloride, and popularly known as Koroseal. This apron is made of that material.
Ref: “Research Spurs New Rubber Uses,” New York Times (Oct. 24, 1935), p. 7.
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