Schematic picture of minesweeper HNLMS Abraham Crijnssen (1936). Picture on a information panel in the Dutch Navy Museum in Den Helder
<a href="//commons.wikimedia.org/wiki/User:Schuppi" title="User:Schuppi">Schuppi</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>