Transistor radio
A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, made possible by the invention of the transistor in 1947, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s. Their pocket size sparked a change in popular music listening habits, allowing people to listen to music anywhere they went. Beginning in the 1980s, however, cheap AM transistor radios were superseded by devices with higher audio quality such as portable CD players, personal audio players, boomboxes, and (eventually) smartphones, some of which contain radios themselves.
History of Chrysler
In 1955 things brightened with the introduction of Virgil Exner's successful Forward Look designs, followed in 1956 by Chrysler's pioneering adoption of transistor radios in cars. On April 28, 1955, Chrysler and Philco had announced the development and production of the world's first all-transistor car radio. The Mopar model 914HR was developed and produced by Chrysler and Philco and was an $150.00 "option" on the 1956 Imperial automobile models. Philco was the company that had manufactured the all-transistor car radio Mopar model 914HR, starting in the fall of 1955 at its Sandusky, Ohio plant, for the Chrysler corporation. 
With the inauguration of the second generation Forward Look cars for 1957, Torsion-Aire suspension was introduced. This was not air suspension, but an indirect-acting, torsion-spring front suspension system which drastically reduced unsprung weight and shifted the car's center of gravity downward and rearward. This resulted in both a smoother ride and significantly improved handling. A rush to production of the 1957 models led to quality control problems including poor body fit and finish, resulting in significant and early rusting. This, coupled with a national recession, found the company again in recovery mode.