Cool videos ! The Germans and their precision of all things mechanical is always fun to see. Somewhat off topic - but years and years ago when I was a serious fisherman I had 2 or 3 spincast fishing reels made by German company called Quick they were the most precise and simple well made reels I had, even the Daiwa and Shimano couldn't equal the quality and precision of the Quick's.
Ok - sorta dumb but them Germans are good with engineering stuff