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| | Defining a Record (Gramophone) :: The Record Collectors Guild :: A website for the Record Collector. |
 | | Recording on disc as opposed to phonograph cylinder had been experimented with by such inventors as Charles Cros, Thomas Edison and Chichester Bell, but the first to actually develop usable disc record technology was Emil Berliner, a German working in Washington, DC, in 1884. |
 | | All speeds of records were made in various sizes, mainly 7, 10 and 12 inches (18,20.5 and 30.5 cm aprox.) diameter; the 7-inch being most common for the 45rpm, the 10-inch for the 78 (and the first few years of 33⅓ production), and the 12-inch for the 33 from the mid 1950s on. |
 | | Recordings of popular music, however, were limited to a maximum of about 23 minutes per side (hence the popularity of the C90 compact audio cassette which runs for 45 continuous minutes per side). |
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