The Zeppelin-Staaken E-4-20 was a revolutionary four-engined all-metal passenger monoplane designed in 1917 by Adolf Rohrbach and completed in 1919 at the Zeppelin-Staaken works outside Berlin Germany. The E-4-20 is likely to have been the first 4-engined all-metal heavier-than-air aircraft ever built. The Zeppelin company is today better known for their Zeppelin airships or lighter-than-air dirigible aircraft.
Made by Zeppelin-Staaken.