THIS DAY IN POP CULTURE HISTORY
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The First Long-Playing Record Spins (June 21)
Up until 1948, records came in just two speeds 7-inch 45 RPM and 10-inch 78 RPM. But on this day, a new long-playing record, a 10-inch 33⅓ RPM was introduced.

Up until 1948, records came in just two speeds 7-inch 45 RPM and 10-inch 78 RPM. But on this day, a new long-playing record, a 10-inch 33⅓ RPM was introduced.
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