Word: semon
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Dates: during 1990-1999
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DIED. WALDO SEMON, 100, inventor and holder of 116 patents including vinyl and bubble gum; in Hudson, Ohio. As a young researcher for B.F. Goodrich, he turned a little-known chemical called polyvinyl chloride into a flexible, functional material. And as the U.S. was on the verge of depleting its natural rubber supply during World War II, he led the effort to produce a viable synthetic...