Does anyone know who has made these diagrams?
I reckon that it was a published in German, so the author is probably from Germany.
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1It hasn't helped so far, but we've had this diagram before. – Macaco Branco Aug 08 '21 at 11:29
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Thanks, but why is an Australian website using a German diagram? (perhaps because it is still helpful) – Jannis Aug 09 '21 at 12:13