Notice of Appearance for A. Klevorn

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					                                UNITED STATES OF AMERICA
                      BEFORE THE FEDERAL TRADE COMMISSION

                            Before the Honorable Stephen J. McGuire
                                    Administrative Law Judge


In the Matter of                       )
                                       1
ASPEN '1KCHNOLOGY,INC.,                )                     Docket Nu. 931 0
         a corporation                 1

                                  NOTICE OF APPEARANCE

         1hereby enter my appearance as counsel for non-party Praxair, Inc. ("Praxair") in this

matter. T am a member in good standing of the bar of Illinois (No. 61 94597).

         Service of documents with respect to Praxair should be directed to me at the address

below.

Dntsd: April 29, 2004




                                                         STAHL K L E V O & SOL
                                                     EIMER               ~
                                                     224 S. Micl-iigm Avc., Suite 1 100
                                                     Chicago, IL 60604
                                                     3 12-660-7600
                                                     3 12-692-1718 (fax)

                                                     Counsel for non-party
                                                     Praxair, h c .