Editing Roller coaster inversion (section)

=== Corkscrew (1968–1976) ===
[[File:MagicMountain Gardaland Screw.jpg|thumb|Corkscrews on the [[Magic Mountain (roller coaster)|Magic Mountain]] roller coaster (1985) at [[Gardaland]] in [[Italy]]]]
The concept of inverting riders was not revisited until the 1970s. In 1968, Karl Bacon of [[Arrow Dynamics]] created a prototype [[steel roller coaster]] with a [[Corkscrew (roller coaster element)|corkscrew]], the first of its kind. The prototype proved that a tubular steel track, first pioneered by Arrow to create [[Disneyland]]'s [[Matterhorn Bobsleds]] in 1959, could execute inversions both safely and reliably.<ref name="cg" /> The full model of the prototype, aptly named [[Corkscrew (Silverwood)|Corkscrew]], was then installed in [[Knott's Berry Farm]] in [[Buena Park, California|Buena Park]], [[United States]], making history as the world's first modern inverting roller coaster (it was relocated to [[Silverwood|Silverwood Park]] of [[Idaho]] in 1990).<ref name="tl" /> In 1976, the previously disastrous vertical loop was successfully revived when [[Anton Schwarzkopf]] constructed the [[The New Revolution (roller coaster)|Great American Revolution]] at [[Six Flags Magic Mountain]] of [[Valencia, California|Valencia]], United States, which became the world's first complete circuit looping roller coaster. Another roller coaster named [[Corkscrew (Cedar Point)|Corkscrew]], built in [[Cedar Point]] of [[Ohio]] in the same year, became the first with three inversions.<ref name="cg" />