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earlier, while i was fiddling with the car ac controls, it occurred to me i have no idea how those sets of buttons that can only have one of them pressed at a time work
@LaserScheme something with levers I think, when you push a button down it pushes up all the other buttons
@LaserScheme I think there's a bunch of ways to do it, but a solution that I've seen is basically each button pushes a lever that reverses the direction to push on a rake (with a tooth missing for the current button) that pops the others out. There's a separate lever/rake for each button.
@LaserScheme oldschool tv channel selectors are a mystery to me