The CDC 1604 was the first practical commercial computer based on transistors.
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In August 1948 German physicists Herbert F. Mataré (1912–2011) and Heinrich Welker (1912–1981), working at Compagnie des Freins et Signaux Westinghouse in Aulnay-sous-Bois, France applied for a patent on an amplifier based on the minority carrier injection process which they called the "transistron".
Heil is mentioned as the inventor of an early transistor-like device (see also History of the transistor), based on several patents that were issued to him.
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