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This image is a derivative work of the following images:
2008-09-17T22:15:08Z McSush 460x550 (2863 Bytes) {{Information |Description={{de|1=Eine Parabel mit Beschriftung und Reflektionseigenschaft.}} {{en|1=parabola with description and reflections of rays.}} |Source=Own work by uploader, based on the png-Image "Parabel.png" from
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{{Information |Description={{de|1=Eine Parabel mit Beschriftung für geometrische Herleitung des Fokus.}} {{en|1=parabola with marks for derivation of the focus.}} |Source=*File:Parabel.svg |Date=2009-09-01 22:12 (UTC) |Author=*[[:File:Parabel.svg|