ANSWERS: 3
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LP is an acronym that stands for long playing records, so named because they can hold up to an hour of music, half on each side. They are made of vinyl and play at 33-1/3 revelations per minute. LPs were invented by Peter Goldmark in 1948.
Source:
History of Rock: Why 78, 45 and 33 1/3 record formats?
Trivia Library: History and Story Behind Inventions: LP Record
More Information:
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"Long Playing"
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Long Playing (record)
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