Does anyone know who has made these diagrams?

enter image description here enter image description here

I reckon that it was a published in German, so the author is probably from Germany.

  • 1
    It hasn't helped so far, but we've had this diagram before. Aug 8 at 11:29
  • Thanks, but why is an Australian website using a German diagram? (perhaps because it is still helpful)
    – Jannis
    Aug 9 at 12:13

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