A niece of Max Ringer, Estelle Paula (Pat El) Ringer, survived, and provided Testimony at Yad Vashem. Please see other docs 'Yad Vashem records' on Celine's page, for her Testimonies, and records at Yad Vashem holocaust database.
Records have been found, showing that Max Ringer was a CRAFTSMAN, and DIAMOND POLISHER.