Dave was right on the mark!
Only, has your S-key jammed ?
Guido Priesel had only one "s" in his name. And the abbreviation should read "KEP" (Kampf-Einsitzer Priesel).
Some additional facts: The machine was built in the Wieland workshops in Vienna early in 1918. It was powered by a fully enclosed 145hp Hiero engine. In his brief entry Keimel told it had a "special aileron control".
The free mounted wings give the impression the whole wing was mouvable around the single upright strut. But I believe the warping was done by the oblique strut, that bend the front and rear part of the upper and lower wing.