The helicoid was first documented by J. Meusnier around 1775, it was the first unbounded non-periodic minimal surface to be found. In addition, besides the plane it is the only known ruled minimal surface (zero mean curvature). 
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The helicoid was first documented by J. Meusnier around 1775, it was the first unbounded non-periodic minimal surface to be found. In addition, besides the plane it is the only known ruled minimal surface (zero mean curvature).
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