 Chrysler offered this all-transistor car radio, Mopar model 914HR, available as an "option" in the fall of 1955, for its new line of 1956 Chrysler and Imperial cars.Philco was the manufacturer of these all-transistor car radios for the Chrysler Corporation and had also used its surface-barrier transistors in the radio's circuitry design.Starting in 1955, Philco had decided to sell commercial manufacturing license agreements with other large electronic semiconductor companies, which allowed them the right to produce and sell its high-frequency surface-barrier transistors.