Back in the late sixties' working at a Texaco station we did the same as sidartha did, plastic holder and carboard record,I worked at a Standard Oil station with my dad in the 80's. We used to put a little plastic holder inside the glove box with a folded piece cardboard that was a record. It kept track of oil changes, weight and brand. Tune up and filter changes. Most others used the stickers. I think the stickers went away in the late 80's when the Iffy Lube 5 minute oil change type buisenesses started.
If you're at a yard sale and there's a box of round black thingies, they were a storage medium for music. You put 'em on a machine and they went round and round and music came out. And if there's a camera in a old box that has a little door that flips open and it's sort of empty inside, it probably used some stuff we used to call film.
dammit i'm getting old........