The first patent for the field-effect transistor principle was filed in Canada by Austrian-Hungarian physicist Julius Edgar Lilienfeld on October 22, 1925, but Lilienfeld published no research articles about his devices, and his work was ignored by industry.ince Bell Labs did not make a public announcement of the transistor until June 1948, the transistron was considered to be independently developed. Matare matarÃ© had first observed transconductance effects during the manufacture of silicon diodes For german radar equipment DURING. wwii
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