An FFP3 mask.
Rudolf Goldhammer <a href="//commons.wikimedia.org/w/index.php?title=User:Ru-go&amp;action=edit&amp;redlink=1" class="new" title="User:Ru-go (page does not exist)">Ru-go</a>
2007-07-07
<span class="int-own-work" lang="en">Own work</span>