Once upon a time, long, long ago, three analogue video disc formats were battling to become the world standard. Philips had Laservision, later to become Laser Disc. RCA pushed a bizarre system called CED Selectavision while JVC developed VHD. CED and VHD relied on a mechanical pick-up to track the disc, but Laservision used a laser, with no wear on the disc. It was blindingly obvious which system would win in the end. All today's digital CD and DVD formats have spun off from Laservision. RCA went bust trying to push the doomed CED format. But JVC was saved from a similar fate by the money from VHS royalties.
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