Electric motor placed on a workbench that concealed one of the hiding places Stefan Petri built in his home in Wawer, Poland. Stefan, his wife, Janina, and their son, Marian, were Polish Catholics. On September 1, 1939, Germany invaded Poland and began subjugating the Polish people. Uncertain of what might occur, Stefan built a basement hiding place concealed by a cabinet. In mid-1942, the Germans deported 300,000 Jews from the Warsaw Ghetto to Treblinka killing center. Stefan learned that his Jewish dentist and friend, Dr. Szapiro, his wife Ela, and their adult sons, Jerzy and Marek had es...