"Karl Hagenauer (1898–1956) was an influential Austrian designer in the Art Deco style.
Goldsmith. Carl Hagenauer founded what became the Werkstätte Hagenauer Wien in 1898. His oldest ...
son, Karl, who would eventually assume leadership of the family business, enrolled at the Vienna School of Applied Arts at age eleven. There he studied with Josef Hoffmann and Oskar Strnad and created designs for the Wiener Werkstätte art collective. After wartime service in the infantry, he resumed his training and qualified as an architect. He joined the family business in 1919." - (en.wikipedia.org 31.01.2020)