That's just another modification of Richard T. Whitcomb invention, the winglets, that serve to reduce drag by moving the wing tip vortex outboard. Another example is Chinese An-2 - Shijianzhuang built Y5-B, and NASA studies of highly-modified C-5 with devices like these.
Seems also that Mrówka winglets are ajustable-angle stuff, but I can be wrong.
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