Minimal non-holonomic torses of the sekond kind

We consider non-holonomic smooth two-dimensional distributions of planes with zero mean curvature and zero total curvature of the second kind in the three- dimensional Euclidean space $E_3$. They are called minimal non-holonomic torses of the second kind ($MNT-2$). We prove that there exist three types of $MNT-2$ and study geometric properties of all these types.