Mundstück einer B-Trompete - Schülerprojekt, cc-by-sa3.0 Finn.W.
<a href="//commons.wikimedia.org/wiki/User:Andre.Spang" title="User:Andre.Spang">Andre.Spang</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>