Walter H. Schottky (1886-1976) 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.
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Islandia, New York
Islandia is a village located in Suffolk County, New York. As of the 2000 census, the village had a total population of 3,057.
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