Parametric Technology Corp. 2007 . 20, 27 , 4 : -, , CAM- Pro/TOOLMAKER 8.1 PTC - -2007 Mathcad 14.0 Arbortext IsoDraw 7.0 PTC web- Windchill PTC -CD Pro/TOOLMAKER 8.1 PTC -CD Arbortext Isodraw 7.0 (PDF)