It did not become practical until the early 1950s.Initially known simply as the junction transistor.First BJT was invented early in 1948, only weeks after the point contact transistor. ![]() The point-contact transistor was commercialized and sold by Western Electric and others but was rather quickly superseded by the junction transistor. It was made by researchers John Bardeen & Walter Houser Brattain at Bell Laboratories in December 1947. The First Transistor: Point-contact transistor A point-contact transistor was the first type of solid state electronic transistor ever constructed.
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