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2011-04-30 13:01 Spinningspark 717×554× (83403 bytes) {{Information |Description=Matteucci's frog battery. Some of the figures have been trimmed out of the original and the contrast has been adjusted for better visibility. |Source=[http://books.google.co.uk/books?id=wU9FAAAAcAAJ&pg=PA284#v=onepage&q&f=true
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