The principles of magnetic amplifiers were applied non linearly to create magnetic digital logic gates. That era was short, lasting from the mid-1950s to about 1960, when new fabrication techniques produced great improvements in transistors and dramatically lowered their cost. Only one large-scale mag amp machine was put into production, the UNIVAC Solid State, but a number of contemporary late-1950s/early-1960s computers used the technology, like the Ferranti Sirius, Ferranti Orion and the English Electric KDF9, or the one-off MAGSTEC.
https://en.wikipedia.org/wiki/Magnetic_amplifier
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