in Germany, and on 15 November 1887 in the United States. He also obtained different patents in Austria-Hungary, Belgium, France and England. His dry cell became known in 1890, when a friend of his shopkeeper asked him for help because the door bell did not work. Later also the other dealers wanted his dry cell.

Subsequently, the director of the Erfurt post-office ordered 100,000 batteries, forcing Gassner to establish a factory in