Before revision: History 310x310px|1957, Diagram of one of the SiO2 transistor devices made by Frosch and Derrick The principle of complementary symmetry was first introduced by George Sziklai in 1953 who then discussed several complementary bipolar circuits.
After revision: History The principle of complementary symmetry was first introduced by George Sziklai in 1953 who then discussed several complementary bipolar circuits.