File:Aluminum disk.jpg

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Aluminum disk (audio recording) used in the 1930s for instantaneous recording. Image courtesy Sarah Stauderman from Library of Congress collection.

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current15:54, 11 January 2012Thumbnail for version as of 15:54, 11 January 20121,600 × 1,200 (50 KB)Sstauderman (Talk | contribs)Aluminum disk (audio recording) used in the 1930s for instantaneous recording. Image courtesy Sarah Stauderman from Library of Congress collection.
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