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                                                                  Exhibit 3.19.3

                               ARTICLES OF MERGER

                       OF DOMESTIC SUBSIDIARY CORPORATION
                              (KING AVIATION, INC.)

                                      INTO

                           DOMESTIC PARENT CORPORATION
                           (KING KNOB COAL CO., INC.)

      Pursuant to the provisions of Section 119, Article 1, Chapter 31 of the
Code of West Virginia, 1931, as amended, the undersigned corporation adopts the
following Articles of Merger for the purpose of merging a subsidiary corporation
into the undersigned as the surviving corporation:

      The following Plan of Merger was approved by the Board of Directors of the
undersigned, as the surviving corporation, in the manner prescribed by Section
117, Article 1, Chapter 31 of the Code of West Virginia, 1931, as amended:

                                 PLAN OF MERGER

            WHEREAS, King Knob Coal Co., Inc., a West Virginia corporation
      ("King Knob"), is the sole owner of all of the outstanding shares of the
      stock of King Aviation, Inc., a West Virginia corporation ("King
      Aviation"); and

            WHEREAS, King Knob desires to merge with King Aviation into a single
      corporation, with King Knob being the surviving corporation;

            NOW, THEREFORE, pursuant to the West Virginia Corporation Act, the
      provisions of which permit the merger of a subsidiary corporation
      organized and existing under the laws of West Virginia into a parent
      corporation organized and existing under the laws of West Virginia, King
      Knob, being the parent corporation, hereby adopts a Plan of Merger as
      follows:
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            1. The name of the corporations proposing to merge are King Knob
      Coal Co., Inc., and King Aviation, Inc.

            2. The surviving corporation shall be King Knob Coal Co., Inc.

            3. In view of the fact that King Knob owns directly all of the
      outstanding capital stock of King Aviation, each share of the stock of
      King Aviation outstanding immediately prior to the effective date of this
      merger and all rights in respect thereof shall forthwith be cancelled and
      no additional shares of the stock of King Knob shall be issued as a result
      of the merger.

            4. The terms and conditions of the merger are as follows:

                (a) The Certificate of Incorporation of King Knob as in effect
            on the date of the merger provided for in this Plan of Merger shall
            continue in full force and effect as the Certificate of
            Incorporation of the surviving corporation.

                (b) The by-laws of the surviving corporation as they shall exist
            on the effective date of the merger provided for in this Plan of
            Merger and in particular the number of directors and officers set
            forth therein shall be and remain the by-laws of the surviving
            corporation until the name shall be altered, amended or repealed as
            therein provided.

                (c) This merger shall become effective upon filing.

            SECOND: The outstanding shares of all classes of stock of King
      Aviation, Inc. are comprised of two hundred and fifty (250) shares of
      common stock, all of which are owned by King Knob Coal Co., Inc.

            THIRD: King Knob Coal Co., Inc., the sole shareholder of King
      Aviation, Inc. has waived as of August 29, 1980 the requirement of a
      mailing of a copy of the Plan of Merger, and accordingly no Plan of Merger
      has been mailed to the shole shareholder of King Aviation, Inc. pursuant
      to Section 31-1-119(c) of the West Virginia Corporation Act.
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      IN WITNESS WHEREOF, said KING KNOB COAL CO., INC. has caused these
Articles of Merger to be executed by its duly authorized officers, this 24th day
of December, 1980.


                                    By:  /s/ Daniel A. Mathews
                                         -------------------------
                                    Name:  Daniel A. Mathews
                                    Title: Vice President


                                    By:  /s/ Timothy N. Wallach
                                         -------------------------
                                    Name:  Timothy N. Wallach
                                    Title: Assistant Secretary

STATE OF NEW YORK  )
                   )    ss:

COUNTY OF NEW YORK )

      I, Stephen M. Vine, a Notary Public, do hereby certify that on this 24th
day of December, 1980, personally appeared before me Daniel A. Mathews, who,
being by me first duly sworn, declared that he is the Vice President of King
Knob Coal Co., Inc., that he signed the foregoing document as Vice President of
the corporation, and that the statements therein contained are true.


                                    /s/ Stephen M. Vine
                                    -------------------------
                                    Notary Public

(NOTARIAL SEAL)