File:PSM V76 D189 Graph of a frog and rat gastrocnemius muscle contractions.png

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English: Graph of a frog and rat gastrocnemius muscle contractions
Date
Source Popular Science Monthly Volume 76
Author Unknown authorUnknown author

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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
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current01:29, 28 March 2012Thumbnail for version as of 01:29, 28 March 20121,617 × 1,638 (1 MB)Ineuw (talk | contribs)

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