The story
For practical reasons, the Polish properties were transferred to Giesche but their operation seem to have been financially unsuccessful. This was in part because Poland had levied a heavy tax on Giesche and it became difficult to borrow German funds to pay these taxes; so the money was sought through a sale of the company to U.S. investors in 1926.
From Wikipedia’s article on Giesche, shared under CC BY-SA 4.0.3