Think of C-Band satellite dishes, Dial-up modems, the eight track tape players, 45 RPM phonograph records, red and blue 3-D glasses.
There are still hundreds of thousands, if not millions, of C band dishes still in use world wide.
A number of people still use dial up modems to access CH.
I've got an old work truck that still has an 8 track player that works (although the only place you can find 8 track tapes is in thrift stores).
45 records are still sold but mostly to collectors.
The old 3-d cardboard glasses are still used in many attractions where the theme park doesn't want to give everybody a $100 pair of newer 3-d glasses.