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A heavy solid line used on a drawing to represent the outline of an object.
A line type that represents an edge that is not directly visible, because it is behind or beneath another surface.
A line consisting of a long dash followed by a short dash that is used to show and locate centers of arcs and cricles, and to describe the center axis of cylindrical forms
A line used to show the alternate positions of an object or matching part without interfering with the main drawing.