The ornamental design for a dual rotorminitoyhelicopter, as shown and described.
FIG. 1 is a perspective view of a dual rotor mini toy helicopter showing my new design where the broken lines are included for the purpose of illustrating portions of the article that form no part of the new design;
FIG. 2 is a left side view of the new design shown in FIG. 1.
FIG. 3 is a front view of the new design shown in FIG. 1.
FIG. 4 is a right side view of the new design shown in FIG. 1.
FIG. 5 is a rear view of the new design shown in FIG. 1.
FIG. 6 is a top view of the new design as shown in FIG. 1; and,
FIG. 7 is a bottom view of the new design shown in FIG. 1.