I saw this little Thorens music box in an antiques store a few days ago. I had to spend a few minutes examining it (trapped as I was _outside_ the locked display case) to work out what it was: A music box that used swappable disks as the "programs" for the music, played by a mechanism otherwise familiar.
• <https://goo.gl/photos/MUheQHyzNSbH6Xsk8>
• <https://en.wikipedia.org/wiki/Thorens>
• <http://www.thorens.com>
• A guy's history & collection with images: <http://keithwright.ca/Thorens/Thorenspage.html>
Thorens made some really amazing and wonderfully weird high-end turntables--including some changers that used machinery different from what most of us had during college: Thorens TD 224. Consult your Google image search for pictorial evidence: Antique Thorens, for example.
Aside: There was at least one changer mechanism that automatically flipped records and played their "B" sides: 1938 Garrard RC-100 Turn-over Record Changer.
And who wouldn't want to play the black vinyl (lacquer, actually) on something that looked like this?: 1921 Kurtzmann Glass Phonograph. Look at the thickness of the record being played.
Mark_
26 February 2017