Kodak AG is the German branch of the Kodak company. It originated at the end of the 19th century as German branch of Kodak in Berlin, named Eastman Kodak GmbH

Later, in the 20th century, the German Kodak branch became listed at the German stock market, and it bought the independent camera maker Nagel, and its founder Dr. August Nagel became general director of the company when it was bought by Eastman Kodak Company on December 1, 1931. Kodak A.G. Dr. Nagel Werk developed its own line of products including the Kodak Retina Camera. The first Retina camera (Type 117) was introduced in the summer of 1934 along with a new 35mm film Daylight Loading Cartridge (DLC). Dr. August Nagel held the German patent for this new 35mm DLC. This 35mm Daylight Loading Cartridge was designed for the Kodak Retina camera and was also designed to retrofit into existing Leica and Contax cameras. Nagel's son Helmut Nagel led the company after the war.

Source: http://camera-wiki.org/wiki/Kodak_AG