  It is shown that, somewhat similar to the case of classical Baecklund
transformations for surfaces of constant negative curvature, infinitely many
axially symmetric minimal hypersurfaces in 4-dimensional Minkowski-space can be
obtained, in a non-trivial way, from any given one by combining the scaling
symmetries of the equations in light cone coordinates with a non-obvious
symmetry (the analogue of Bianchis original transformation) - which can be
shown to be involutive/correspond to a space-reflection.
