Well it is the Asboth AH-4 but it's from Hungary.
I'll give to you anyway.
Skytrain has control
Hungarian engineer Oscar von Asboth, who had worked on the two PKZ machines, designed and tested four different helicopters between 1928 and 1931.
His final machine, the AH-4 used counter-rotating coaxial main rotors powered by a 110hp Clerget rotary engine with multiple hinged vanes in the rotor downwash. Control was very poor, but by mid-1930 the aircraft reportedly attained an altitude of 30m and covered 3.2km at about 19km/h.