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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Biography of Walter H. Schottky (
http://www.geocities.com/bioelectrochemistry/schottky.htm)