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In 1948 Records (CBS) produced the new concept 12-inch unbreakable vinyl discs that could play from 25 to 30 minutes. The original standard shellac disc had revolved at 78-rpm, but the old typed 12-inch record discs had to be changed automatically or manually every five minutes thus, the make-up had to break up the continuity of longer moving parts! The 12-inch LP records revolving at speeds of 331/3 rpm, could hold the average symphony, sonata, or quartet on a single side!
A Cluster of 45rpm 7-inch Vinyl Records Picture
Moreover, the new discovery of the vinyl discs had much quieter surfaces than the shellac discs. It was a certainty that the RCA Victor recording company would be counteract with their own special version of microgroove records in producing the beloved seven-inch 45-rpm vinyl disc and each 45-rpm disc contained approximately as much music as the 12-inch 78-rpm disc, but the package was smaller!