DWG to DXF Converter Pro 

DWG to DXF Converter Pro is a batch DWG and DXF bi-directional converter that allows you to convert DWG to DXF, DXF to DWG without the need of AutoCAD. It is also an AutoCAD drawing file version converter. The Pro version supports command line.
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PDF to DXF 

Aide PDF to DXF is a powerful windows program that will help you convert your PDF files to usable and editable DXF files quickly and easily. You can import DXF files into AutoCAD and save them as DWG format.
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AutoCAD DWG to DXF 

AutoCAD DWG to DXF is a batch DWG DXF bi-directional converter that allows you to convert DWG to DXF, DXF to DWG without the need of AutoCAD. It is also an AutoCAD drawing file version converter.
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Autocad Converter 

Autocad Converter is a batch DWG and DXF bi-directional converter that allows you to convert DWG to DXF, DXF to DWG without the need of AutoCAD. It is also an AutoCAD drawing file version converter.
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DXF Import/Export Converter 

AutoCAD DXF Import/Export plug-in for Pro Grapher that allows to read and manipulate data from and to CAD industry standard DXF files. Easy to use, high-quality conversion.
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DWG to DXF 

DWG to DXF is a batch DWG and DXF bi-directional converter that allows you to convert DWG to DXF, DXF to DWG without the need of AutoCAD. It is also an AutoCAD drawing file version converter.
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