Unusual types of gramophone records - Wikipedia
https://en.wikipedia.org/wiki/Unusual_types_of_gramophone_records
The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (33 1 ⁄ 3, 45, or 78 RPM), and appearance (round black discs).However, since the commercial adoption of the gramophone record (called a phonograph record in the U.S., where both cylinder records and disc records were invented), a wide variety of records have …
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