MITCalc3D for Autodesk Inventor 1.51  
MITCalc is the multi-language mechanical and technical calculation package. It includes solutions for gear, belt and chain drives, springs, beam, shaft, bolt connection, shaft connection and many others. The calculations are compatible with many types of 2D (AutoCAD, IntelliCAD..) and 3D (Autodesk Inventor) CAD systems and support both Imperial and Metric units and are processed according to ANSI, ISO, DIN, BS, Japanese and other standards.

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