Cool model! thanks for sharing the video. Here's a video for the full sized American version
https://www.youtube.com/watch?v=O2BXzV_8glc This guy is fast!
Here's some pictures,
https://www.google.com/search?q=koeh...w=1024&bih=641
Koehring had an agreement to build machines for Menck, it didn't last very long.
Cheers, Neil.