Heinrich Johann Welker (September 9, 1912 in Ingolstadt, Germany - December 25, 1981 in Erlangen, Germany) was a German theoretical and applied physicist who invented the transistron. He did fundamental work in III-V compound semiconductors, and paved the way for microwave semiconductor elements and laser diodes. Starting in 1931, Welker studied at the University of Munich under Arnold Sommerfeld, and was granted a Ph.D. in 1936. Wikipedia
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