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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... of Dalarna. The municipality covers an area of 1500.7 km². Of the total population of 26450, 13112 are male, and 13338 are female. The population density of the ...