TV Ultrasonics
'There were two remote control products prior to the Space Command. The Zenith Lazy Bones came out in 1950, but it was wired, a wire running across the living room from couch to TV, tripping Grandma along the way. In 1955, Zenith produced the Flash-matic, basically a flashlight at a specific frequency, but ambient sunlight sometimes changed the channel. Then in 1956, the Space Command which used ultrasonics...'
-Bill DeRouchey
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