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The following is a brief description of the basic principles and applications of the parametron, which is a digital computer element invented by the author in 1954. A parametron element is essentially a resonant circuit with a nonlinear reactive element which oscillates at one-half the driving frequency. The oscillation is used to represent a binary digit by the choice between two stationary phases Â¿ radians apart. The basic principle of logical circuits using the parametron is explained, and research on and applications of parametrons in Japan are described.