. . . . . . . . . . . . . . . . . . . . . . . . . . . . "Stefan Petri collection"@en . . . . "irn84490" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "The collection consists of a workbench and over forty tools, machines, and machine parts, relating to the experiences of Stefan Petri, who with his first wife, Janina, concealed a Jewish family, Kaufman, Ela, and their sons Marek and Jerzy Szapiro, in two hiding places he built in his home in Warsaw, Poland, from spring 1942 to September 1944."@en .