In 1906, William Walker, an American businessman,visiting Germany, learned of the invention of the vacuum bottle. He immediately began to import and market the new product in the United States. The following year, Walker created the American Thermos Bottle Company and began producing vacuum bottles in a Brooklyn, New York, factory. The product met with such success that the expanded New York plant proved inadequate within the first five years. Walker moved the Thermos Company to Norwich, Connecticut, in 1913. Five years later, the company had nearly doubled its size, and after World War II a second plant was opened in Norwich's Taftville section. The Thermos Company became Norwich's largest employer, with more than 1000 workers.