The Siemens-Schuckert D I, which, in most respects, was a close copy of the Nieuport 11 fighter.

One of the D IIc development aircraft, this is the ‘lang’ prototype with longer-span wing of narrower chord.

The Siemens-Schuckert D III - the photo depicts an early-production aircraft - served in small numbers in 1918.

The extraordinary DDr I was an early attempt to apply the principle of centreline thrust with two engines.