| http://www.w3.org/ns/prov#value | - Outstanding examples among such Czech-Americans are Karl Jansky (1905???1950), whose discovery in 1933 of radio waves emanating from outer space launched the discipline of radio astronomy, and Franti??ek J. Vl??ek (1871???1947), founder of the Vlchek Tool Works in Cleveland, Ohio, whose autobiography and other publications are among the most extensive sources on Czech-American industrial entrepren
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