|Lilienfeld, Julius E. (1927). Canadian lntellectual Property Office. CA272437. Retrieved from: https://worldwide.espacenet.com/patent/search/family/035202468/publication/CA272437A.|
The invention relates to a method of and apparatus for controlling the flow of an electric current between two terminals of an electrically conducting solid by establishing a third potential between said terminals; and is particularly adaptable to the amplification of oscillating currents such as prevail, for example, in radio communication.