The 45 rpm car record players were mostly made by Automatic Radio; some
were made by an RCA subsidiary. They actually worked amazingly well as
far as tracking the records, and sounded quite good playing through the
tube-type car radios. But they were real record-eaters since the pickup
arm was spring-loaded to keep the stylus in contact with the record
groove during typical highway vibration. The pressure on the records
was in ounces, not grams.

Chrysler made the first car players in the late 1950s; their system was
called "Hi-Way Hi-Fi." The name was somewhat of a misnomer since the
records rotated at 16 2/3 rpm. The wow and flutter was pretty bad, plus
you were limited to a repertoire of proprietary records you could only
buy from your Chrysler-Plymouth-DeSoto-Dodge dealer.