A point-contact transistor was the first type of solid-state electronic transistor ever constructed. It was made by researchers John Bardeen and Walter Houser Brattain at Bell Laboratories in December 1947. They worked in a group led by physicist William Bradford Shockley. The group had been working together on experiments and theories of electric...
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http://en.wikipedia.org/wiki/Point-contact_transistor
(from the article `transistor`) ...applied field to penetrate deep into the semiconductor material. Working closely together over the next month, Bardeen and Brattain invented the ...
Found on
http://www.britannica.com/eb/a-z/p/85
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