Coastersandmore.de - Roller Coaster Magazine: SkyWheel and G-Force - X-Car fun by Maurer Söhne at Allgäu Skyline Park and Drayton Manor Family Themepark
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File:Maurer Söhne X-Coaster SkyLoop model (IAAPA 2009).jpg - Wikimedia Commons
Maurer AG - Wikipedia
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