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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 grandpa had a tv store around the time, and he always told the story of him pulling someone's leg by making them believe the tv was voice activated, with that thing in his pocket. So he covered the click sound by yelling at the tv.
I like your grandpa.