I found these diagrams on a website a few years ago. Now I'd like to go back to that website and reread some of the commentary, but I can't member the website address! I couldn't find anything in my bookmarks, and I printed the diagrams without any headers or footers.
I think it may have been a German or Scandinavian university, but I also remember reading something about industrial applications, like inventory for off-shore oil well or something like that.
Do you recognize them?
I found what I think are the originals through https://tineye.com/
The source web page is no longer online, but it was captured by the Internet Archive.