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An aluminum disc (or aluminum disk) is a disc (disk) made out of aluminum and is used as a transcription disc in magnetic recording media, specifically early radio recordings.[1] Aluminum discs are also used in hard disk (as "platters"), shock tubes, and other manufacturing processes. In 1934, the Pyral Company in France, and the Presto Corporation in the United States, independently created the acetate disc by applying a layer of lacquer onto an aluminum disc.[1]
