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• File:Minkowski_diagram_-_time_travel.png licensed with Cc-by-sa-2.5,2.0,1.0, Cc-by-sa-3.0-migrated, GFDL
  • 2007-06-07T10:00:09Z Wolfgangbeyer 764x764 (21277 Bytes) {{Information |Description= |Source=self-made |Date=2005-02-13 |Author= [[User:Wolfgangbeyer|Wolfgangbeyer]] }}

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