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Question about Mark's Hair Dryer model

Question asked by John Reinhard on Oct 10, 2008
Latest reply on Oct 10, 2008 by Charles Culp
In scrolling through Mark's hair dryer model I have come across something I probably should know, but can not figure out.

In the creation of the handle a boundary surface is used. In direction 1 there are three "Open Group" curve segments used. Where did the two Open group-Tangent curves comes from. The layout curve from which the "Surface-Extrude1-draft-ref-for-boundary-surf" is created is a single spline except for the line at the top, so how are these two segments created to be used as boundary curves?