File:Warnlampe Druckverlust.svg - Wikimedia Commons
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File:OpAmpTransistorLevel Colored Labeled ID.svg - Wikimedia Commons
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shas521 SignHealthAndSafety shas - German / Gebotszeichen: Netzstecker ziehen - Vor Öffnen Netzstecker ziehen - english / mandatory action sign: disconnect mains plug from electrical outlet xxl g5133 Stock Illustration
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File:MUTCD W4-8.svg - Wikimedia Commons
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File:Ambox warning pn.svg - Wikipedia
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File:OpAmpTransistorLevel Colored Labeled ID.svg - Wikimedia Commons
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Category:Caution icons - Wikimedia Commons
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File:Hazard E.svg - Wikimedia Commons
File:Zeichen 341 – Wartelinie, StVO 1970.svg - Wikipedia
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File:FileWarning.svg - Wikimedia Commons
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Category:Caution icons - Wikimedia Commons