The Dornier Do 335 Pfeil used a push pull system patented by Dr. Claude Dornier in 1937. It wasn't until 1942 that permission was given to build a prototype.
The front engine was located in the nose, and the rear engine was located in the middle of the fuselage with a long shaft running to the pusher propellar.
The tail was in a cruciform shape.
The Do 335 had a tricycle undercarriage.