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Walter H. SchottkyWalter H. Schottky (July 23, 1886, Zürich, Switzerland - March 4, 1976, Pretzfeld, West Germany) was a German physicist who invented the screen-grid vacuum tube in 1915 and the tetrode in 1919 while working at Siemens. In 1938, Schottky formulated a theory predicting the Schottky effect, now used in Schottky diodes.''This article is a stub. You can help Wikipedia by fixing it.'' 
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