The Long Playing Record was the second disc record format invented (other than Edison records, but they were irrelevant after 1929) in 1948 by Columbia Records. They were originally 10 inches in diameter, later changed to a standard size of 12 inches in the 1950s. They allowed for more than one song to be played on each side because the grooves were smaller and played at a slower speed of 33 1/3 rpm. These records where made of vinyl which was more durable than the shellac that most 78s were made of.
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