No, this isn't a mistake. The firm of Friedrich Deckel began as a camera shutter manufacturer; machine tools were initially just a sideline after they had to develop their own. They were most closely associated with the famous "Compur" brand leaf shutter. This is a photograph of a Compur shutter on a Goerz Tenax camera. This camera and its shutter must predate the 1926 merger of Goerz into Zeiss Ikon. This photograph is by Wikimedia Commons user "Gisling," and is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported license (under the terms of which it is used here). The icon above links to an exact copy of the original. It is available on Wikimedia Commons at: http://commons.wikimedia.org/wiki/File:GOERZ_COMPUR.jpg
