EXHIBIT 3.51

                            ARTICLES OF INCORPORATION

                                       OF

                                 TWO PAC COMPANY

         KNOW ALL MEN BY THESE PRESENTS: That I, the undersigned, for the
purpose of forming a corporation under the laws of the State of Nevada, do
certify:

                                   ARTICLE I

         The name of the corporation is: TWO PAC Company.

                                   ARTICLE II

         The principal place of business of the corporation shall be:

                   1325 Airmotive Way, Suite 100, Reno 89502.

         The Corporation's resident agent shall be:

                     The Corporation Trust Company of Nevada
                   One East First Street, Reno, Nevada 89501

                                   ARTICLE III

         The nature of the business and the objects and purposes to be
transacted, promoted, or carried on by the corporation are to engage in any
lawful act or activity for which corporations may be organized under the General
Corporation Law of Nevada.

                                   ARTICLE IV

         The corporation shall have authority to issue the following:

                  The number of shares of common stock which this corporation is
                  authorized to issue is One Hundred thousand (100,000) shares
                  with a par value of One Cent ($.01) per share.



                                    ARTICLE V

         The number of the Board of Directors shall be:

                  The Board of Directors will consist of one (1) to nine (9).
                  The person who is to serve as Director until the first annual
                  meeting of shareholders or until his successor is elected and
                  qualified is:

         Charles J. Bayer, 3240 E. Pershing, Phoenix, Az. 85032

                                   ARTICLE VI

         The name and address of the incorporator is:

         J. Scott Askew, 2721 N. Central Avenue, Phoenix, Az. 85004

                                   ARTICLE VII

        The period of existence of the corporation shall be:

                                    Perpetual

IN WITNESS WHEREOF, I the aforementioned incorporator have signed the Articles
of Incorporation this 2nd day of December, 1994.

                                                 /s/ J. Scott Askew
                                                 -----------------------------
                                                 J. Scott Askew, Incorporator


STATE OF ARIZONA

COUNTY OF MARICOPA

         THIS IS TO CERTIFY that on the 2nd day of December, 1994, before me, a
Notary Public, personally appeared J. Scott Askew, who I am satisfied is the
person named in and who executed the foregoing Articles of Incorporation and I
first having made known to him the contents thereof, did acknowledge that he had
signed the same as his voluntary act and deed for the uses and purposes therein
expressed.

         IN TESTIMONY WHEREOF, I have hereunto set my hand and affixed my
official seal this 2nd day of December, 1994.

(NOTARIAL SEAL)

                                        /s/ Blanche I. Passolt
                                        ----------------------------
                                        Blanche I. Passolt
                                        NOTARY PUBLIC



Page: 1 Document Name: untitled

NAME: TWO PAC COMPANY

FILE TYP/NR C    18996-1994 ST NEVADA         INC ON DEC 6, 1994 FOR PERPETUAL
  STATUS: CURRENT LIST AS OF : 12-06-02       NUMBER OF PAGES FILED: 3 PME
    TYPE: REGULAR
 PURPOSE: ALL LEGAL ACTIVITIES
                                              CAPITAL:       $1,000

PAR SHRS:        100,000   PAR VAL:     $.010   NR NO PAR SHRS:
  RA NBR:    5482

          LIST OF OFFICERS FOR 02 - 03 FILED ON 12-06-02   ANNUAL LO        MLJ
RA        CORPORATION TRUST COMPANY OF NEVADA STE 500      ACCEPTED      120694
  6100    NEIL ROAD                RENO                     NV 89511
PRES      CARLOS VIZCARRA                 P.O. BOX 21502                 122794
  2727    N. CENTRAL               PHOENIX                  AZ 85004
SECT      JENNIFER M STETTLES             P.O. BOX 21502                 122794
  2727    N. CENTRAL               PHOENIX                  AZ 85004
TRES      DONALD WM. MURNEY               P.O. BOX 21502                 122794
  2727    N. CENTRAL               PHOENIX                  AZ 85004

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