Who actually invented "Slavyanka"?

The participants of the project "Duyunov's motors" know that it is based on the innovative development - the combined winding method for induction electric motors named "Slavyanka".
But there are still questions who invented "Slavyanka".

The idea of using combined "star" and "delta" winding was first announced back in 1906. But the multiple attempts to define the general principles of making combined windings were not successful. Moreover, before Dmitriy Duyunov got his patents, there had already been combined winding patents, but unfortunately their principles were not universal.

The very idea of using the combined "star in delta" winding wasn't introduced by Dmitriy Duyunov, but it is him who was able to define the principles of making combined windings for electric motors.
On this basis, over 300 diagrams for different combinations of slots, coils, circuits, numbers of pairs of poles, etc. have been developed. All versions were checked and all of them provided predictable results. It has become clear that the principle works and and can be widely applied.

Later Duyunov's team realized that motors for combined winding had to be designed differently from classic winding diagrams. And when the design principles were defined and the first electric machine was made, the result exceeded all expectations.

Dmitriy Duyunov is often asked why he named the new technology "Slavyanka"? And that is what he says: "In different periods of time I named the combination "star in delta" differently: orthographic, combined, mixed windings. Then I remembered that at the time the double layer diamond windings had been named "Amerikanka" ("American"), so in return I decided to name the new winding type "Slavyanka" ("Slavic").