Relevant xkcd:

Electromechanical stuff. Like old jukeboxes, pinball machines or anything else that required programming before the widespread use of microcontrollers.

Some people have already mentioned stuff akin to this, like the mechanical govenor, or the post abt THIS MUSEUM IS NOT OBSOLETE, but it really deserves its own thread.

Technology Connections on YouTube has made some great videos about devices like that.

Pinball Jukebox