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MicroStation is a registered trademark of Bentley Systems, Inc. SofTutor is a registered trademark of New Vision Software, Incorporated. This site is copyright 2009, All rights reserved. We'd like to thank nvsi.com and softutor.com for letting us use their content. We'd also like to credit the following authors M. Arroyo, J. Cella, E. Johnson & R. Hilgers.