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The buttons on Zenith’s original “clicker” remote were a mechanical marvel
(www.theverge.com)
This is a most excellent place for technology news and articles.
My parents had an appliance/electronics shop when I was growing up and they took used items on trade occasionally. Someone turned in one of those zenith sets and I actually got to use that remote. Bear in mind we were well into the age of infrared remotes by this point (late 80s).
It was definitely interesting and I think I could just distinguish the difference between the sounds of the buttons.