Waldo Semon (1898–1999), renowned American inventor born in Demopolis, Alabama
Polyvinyl chloride (PVC) was produced experimentally in the 19th century but did not become practical to manufacture until 1926, when Waldo Semon of BF Goodrich Co. developed a method to plasticize PVC, making it easier to process.
Ralph Waldo Emerson | Waldo Frank | Dwight Waldo | Waldo Waterman | Samuel Waldo | Janet Waldo | Waldo Semon | Waldo | The Great Waldo Pepper | Rhinelander Waldo | Ralph Waldo Emerson House | Peter Waldo | Waldo Von Erich | Waldo's People | Waldo Salt | Waldo, Ohio | Waldo Hutchins | The Silver Slipper dance hall adjacent to Sloppy Joe's, painted in the 1930s by Waldo Peirce | Samuel Waldo (merchant) | Richard Semon | Ralph Waldo Emerson Jones | Ralph Waldo Emerson Award | Mo Chuaroc moccu Neth Semon | Lose Control (Waldo's People song) | Larry Semon |