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SolarThermie Tichelmann.svg de February Prinzip einer SolarkollektorAnlage nach dem Prinzip von Tichelmann selbst gebaut nach File Tichelmann Jelko Arnds GPL Tichelmann Jelko Arnds Original upload log de Wdwdbot CommonsHelper de SolarThermieTichelmann svg Jelko Arnds bytes no Andere Versionen Jelko Arnds bytes