Drawing from a 1942-1943 Dornier patent for a push-pull configuration twin-engine aircraft (which would eventually result in the <a href="https://en.wikipedia.org/wiki/en:Dornier_Do_335" class="extiw" title="w:en:Dornier Do 335">Dornier Do 335</a>).
<a href="//commons.wikimedia.org/wiki/User:MLWatts" title="User:MLWatts">MLWatts</a>
2012-03-13
Own work based on: <a rel="nofollow" class="external autonumber" href="http://worldwide.espacenet.com/publicationDetails/originalDocument;jsessionid=9A258EFAC41D193711B15998A0F92767.espacenet_levelx_prod_5?CC=DE&amp;NR=728044C&amp;KC=C&amp;FT=D&amp;ND=1&amp;date=19421118&amp;DB=EPODOC&amp;locale=fr_FR">[1]</a>