We also developed helicopter(s). The K.u.K. Fliegerarsenal assigned the task to Hungarian factories and engineers to build a helicopter to replace observer balloons during the summer of 1917. The PKZ-1 was a dead end as there wasn't enough manufacturing capacity to build the electric engines for that one. The PKZ-2 was more successful, it had 36 experimental flights but at the end of June 1918 it crashed and with the end of the war the project was abandoned.
Both model have several "the world's first..." titles but I'm not sure how to translate them, but for example the PZK-2 held the record of flight height and period of time, which remained unofficial as wartime achievements weren't recorded by Fédération Aéronautique Internationale.