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Excitech Toolkit for AutoCAD - Convert to 3D Polyline - YouTube
how to convert 3d polylines or 2d polylines to polylines in autocad using lisp | CTL84 - YouTube
Civil 3D 2013: 2D and 3D Polyline Conversion | Ideate Inc
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AutoCAD > Geometry > Convert to 3D Polyline | KobiLabs
Convert 3D to 2d Polylines in flexible ways - YouTube
convert polylines to 3d polylines without creating a surface - Autodesk Community
Quick Section Software | Convert 3D Polyline as a Section
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Civil 3D 2013: 2D and 3D Polyline Conversion | Ideate Inc
Lisp Help: Collection of AutoLisp for 3D Polyline Entities
