Lou Ottens - Thank you and G-d Bless! RIP.
In the 1950-60s THIS was really a cool add-on! Not so sure I'd use it on anything but the smoothest of roads ... on second thought not even then!
And below was the cassette's closest competition, the 'Lear 8-Track Tape', yes, Bill Lear of the Lear Jet fame (1964)!
I turned down a used car once just because there was another very similar one at a close price match. The reason? Car A had the 8-Track while Car B had a AM radio that I could easily replace with an AM-FM Cassette unit! 8-Track = self-destruct!