Assertion: car door | /r/HasProperty | hinged at the roof
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text: A gull-wing door, also known as a falcon-wing door or an up-door, is an automotive industry term describing car doors that are hinged at the roof rather than the side, as pioneered by the 1952 Mercedes-Benz 300SL race car (W194) and its road-legal version (W198) introduced in 1954.