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Semon, Waldo Lonsbury
Born: 1898 AD
Died: 1999 AD, at 101 years of age.
Nationality: Unknown
Categories: None
Died: 1999 AD, at 101 years of age.
Nationality: Unknown
Categories: None
US industrial chemist and inventor
invented polyvinyl chloride 1928 (patented 1933)
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