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© buildingSMART 1996-2009

By using the IFC2x4 beta 3 version specification you agree to the following copyright notice

The specification has been developed in 1999-2009 by the Model Support Group (MSG) of buildingSMART.
Thomas Liebich (lead),Yoshinobu Adachi, James Forester, Juha Hyvarinen, Stefan Richter, Tim Chipman, Matthias Weise, Jeffrey Wix^†