Quote:
Originally Posted by Pete Deksnis
One system had a set of buttons mechanically linked to hammers that would strike ultrasonic chimes. Made a loud click, but young ears could not hear the aural data pulse. Had a 35-mm slide projector like that in the early '60s; anyone know if the system was used on a TV?
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That was the system that Zenith patented around 1956, after the Flashmatic. Admiral and possibly a few others used it a little later.