(Christoph Kreutzmüller) Dr. Christoph Kreutzmüller, a German scholar, has done seminal work, creating a database of businesses that were Jewish-owned in Nazi-era Berlin. As I’ve said previously, Christoph’s sleuthing for his book FINAL SALE IN BERLIN, The Destruction of Jewish Commercial Activity, 1930-1945 fills a gap in the record that so frustrated me while I was seeking restitution for…