24th December 1947


The Germanium Transistor.
The Photograph below is a replica of the first working transistor built by John Bardeen (1908-91), William Bradford Shockley (1910-89) and Walter Houser Brattain (1902-87) Bell Telephone Laboratories USA. It was first demonstrated on December 24th 1947.  Today thousands of transistor circuits can be etched on to a single silicon chip the size of a match head.


Photo Copyright Bell Labs USA


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