Based on a design by <a href="//commons.wikimedia.org/w/index.php?title=User:Electrical_Experiment&amp;action=edit&amp;redlink=1" class="new" title="User:Electrical Experiment (page does not exist)">User:Electrical Experiment</a>, uploaded with his permission
<a href="//commons.wikimedia.org/wiki/User:Killervogel5" title="User:Killervogel5">Killervogel5</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>