Many years ago I read a novel that takes place during WWII about the inception of the Mosquito Bomber, unfortunately I can't remember the name of that book. If anyone saw the movie Monuments Men, all the stolen artwork was hidden in underground mines owned by Zeiss Optical. In the Novel I read, the first bombing mission of the Mosquito Bomber was Zeiss Optical in Germany. Zeiss made binoculars, periscopes and bomb sites, among other things, for the German war effort. They are still around today.