RCA's new "SelectaVision" VideoDisc player now under development employs a diamond stylus which tracks a recorded signal that moves at a 450 rpm turntable speed. Microscopic photography is used to check samples of the diamonds used in the cartridges being assembled at RCA's Rockville Road plant in Indianapolis. RCA plans a nation-wide product introduction in the first quarter of 1981.
- December 6, 1979 press release that accompanied the above photo.

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