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2. Twelve-inch single - Wikipedia

   en.wikipedia.org/wiki/Twelve-inch_single

   A twelve-inch Capitol Records gramophone record. The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.

3. LP record - Wikipedia

   en.wikipedia.org/wiki/LP_record

   The LP (from long playing [2] or long play) is an analog sound storage medium, specifically a phonograph record format characterized by: a speed of 33 + 1 ⁄ 3 rpm; a 12- or 10-inch (30- or 25-cm) diameter; use of the "microgroove" groove specification; and a vinyl (a copolymer of vinyl chloride acetate) composition disk.

4. Unusual types of gramophone records - Wikipedia

   en.wikipedia.org/wiki/Unusual_types_of...

   Test pressings were made at the normal 12-inch and 10-inch sizes in addition to the 7-inch sizes noted below for both 8 + 1 ⁄ 3 as well as 16 + 2 ⁄ 3. However, with mastering facilities of the period only going as low as 16 rpm, the quadruple-speed mastering required to get a playback speed of 4 rpm was deemed to have an insufficient audio ...

5. Phonograph record - Wikipedia

   en.wikipedia.org/wiki/Phonograph_record

   Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.

6. Electrical transcription - Wikipedia

   en.wikipedia.org/wiki/Electrical_transcription

   If there was no such notation, an outside start was assumed. Beginning in the mid-1950s, some transcription discs started employing the "microgroove" groove dimensions used by the 12- and 10-inch 33 + 1 ⁄ 3 rpm vinyl LP records introduced for home use in 1948. This allowed 30 minutes to fit comfortably on each side of a 16-inch disc.

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