Passage: Otto Fredrik Gideon Sundback was born on Sonarp farm in Ödestugu Parish, in Jönköping County, Småland, Sweden. He was the son of Jonas Otto Magnusson Sundback, a prosperous farmer, and  his wife Kristina Karolina Klasdotter. After his studies in Sweden, Sundback moved to Germany, where he studied at the polytechnic school in Bingen am Rhein. In 1903, Sundback took his engineer exam. In 1905, he emigrated to the United States.

Question: When did Sundback graduate from school in Bingen am Rhein?
1903