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  • [[File:Amberola close-up.jpg|thumb|Close up of the mechanism of an Edison Amberola, circa 1915]] ...f a spiral groove engraved, etched, incised, or impressed into the surface of a rotating cylinder or disc, called a [[gramophone record|"record"]]. To re
    115 KB (17,286 words) - 16:32, 16 December 2018