http://0rz.tw/2b5ky
Abstract of US 5255452 (A)
A system for allowing a shoe wearer to lean forwardly beyond his center of
gravity by virtue of wearing a specially designed pair of shoes which will
engage with a hitch member movably projectable through a stage surface. The
shoes have a specially designed heel slot which can be detachably engaged
with the hitch member by simply sliding the shoe wearer's foot forward,
thereby engaging with the hitch member.
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