The curse of the gull-wing door may be descending on Tesla Motors. For decades, those top-hinge doors have captivated car designers and enthusiasts - and flummoxed the car engineers and owners who must make them work. Despite numerous attempts dating to the 1950s, no automaker has successfully marketed a high-volume vehicle with the feature. Now upstart Tesla is running into quality problems and potential safety issues related to its "falcon-wing" rear doors on the Model X.
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