This file (and associated files) have been downloaded from Ultrasonic-resonators.org.
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This download may contain the following files -
1. FreeCAD (file extension FCStd). FreeCAD is a free open-source 3D parametric modeler. Using FreeCAD the model dimensions can be adjusted to suit your requirements. See freecadweb.org. 
2. Step file - can be imported to many software modelers
3. Drawing - may be a dxf file (with or without dimesions) or an image

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Regards.
