File:PSM V57 D372 A musical tone.png

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English: A musical tone
Date
Source Popular Science Monthly Volume 57
Author Unknown authorUnknown author

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Public domain
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
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current03:42, 12 July 2011Thumbnail for version as of 03:42, 12 July 20111,596 × 317 (131 KB)Ineuw (talk | contribs)

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