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This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Heptagon
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The original description page was here. All following user names refer to en.wikipedia.
2005-06-15 06:51 Unc.hbar 600×928× (65553 bytes) Diagram of a simple gravity pendulum. {{PD-ineligible}}
The original description page was here. All following user names refer to es.wikipedia.
2005-12-18 19:22 Arnold bogdano 300×464×8 (11976 bytes) http://en.wikipedia.org/wiki/Pendulum#Analysis_of_a_simple_gravity_pendulum
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