File:Loop the Loop Coney Island patent.png - Wikimedia Commons
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Disney Patents New "Drop Swing Propulsion" Roller Coaster & Water Ride Experience
The roller coaster is patented, December 22, 1885 - EDN
Disney Patents New "Drop Swing Propulsion" Roller Coaster & Water Ride Experience
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Nightmare - Roller Coaster | Firefly Creations
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Vintage Roller Coaster Patent Poster Prints 4 Unframed - Etsy
Gallery of Roller Coaster / Peripheriques Architectes - 39
Coasters-101: What software do roller coaster engineers use? - Coaster101
Printed Copy of Ice Mountain Plans, Signed by Roger Tofte | enchantedforest