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                     SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549


                                 FORM 8-A/A

             FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                 PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                      SECURITIES EXCHANGE ACT OF 1934

                              AMENDMENT NO. 4

                            ATL ULTRASOUND, INC.
           (Exact name of registrant as specified in its charter)


           WASHINGTON                              91-1353386
     (State of incorporation                     (IRS Employer
         or organization)                      Identification No.)

   22100 Bothell Everett Highway                   98041-3003
           P.O. Box 3003                           (Zip Code)
        Bothell, Washington
(address of principal executive offices)


Securities to be registered pursuant to Section 12(b) of the Act:

                                    None
                              (Title of Class)

     If this form relates to the registration of a class of securities
pursuant to Section 12(b) of the Exchange Act and is effective pursuant to
General Instruction A.(c), check the following box. [ ]

     If this form relates to the registration of a class of securities
pursuant to Section 12(g) of the Exchange Act and is effective pursuant to
General Instruction A.(d), check the following box. [ ]

     Securities Act registration statement file number to which this form
relates:

     ...............(if applicable)

     Securities to be registered pursuant to Section 12(g) of the Act:


                                             Name of exchange on
         Title of each Class                which each class is to
         to be so registered                     be registered

    Series A Participating Cumulative        NASDAQ National Market 
     Preferred Stock Purchase Rights


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     Item 1 of Form 8-A dated February 26, 1988 (as amended through June
26, 1992, the "Form 8-A"), of Westmark International Incorporated is hereby
amended as follows:

ITEM 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

     Item 1 of the Form 8-A is hereby amended by adding the following
paragraph at the end of Item 1 of the Form 8-A:

     On July 29, 1998, ATL Ultrasound, Inc. (the "Company") executed an
amendment (the "Amendment") to the Amended and Restated Rights Agreement,
dated as of June 26, 1992 (the "Rights Agreement"), between Advanced
Technology Laboratories, Inc. (formerly known as Westmark International
Incorporated) and First Chicago Trust Company of New York, as Rights Agent.
The Amendment provides that neither Philips Electronics North America
Corporation, a Delaware corporation ("Parent"), Philips Acquisition, Inc.,
a Washington corporation and a wholly owned subsidiary of Parent ("Merger
Sub"), any of their respective Affiliates or Associates nor any of their
respective permitted assignees or transferees will become an Acquiring
Person (as that term is defined in the Rights Agreement) as a result of the
occurrence of any of the following: (i) the commencement of the Offer (as
defined in the Agreement and Plan of Merger dated as of July 29, 1998,
among Parent, Merger Sub and the Company (the "Merger Agreement")), (ii)
the approval, execution or delivery of the Merger Agreement, (iii) the
consummation of the Merger (as defined in the Merger Agreement) or (iv) the
consummation of the other transactions contemplated by the Merger
Agreement. The Amendment further provides that, despite the occurrence of
any of the events described under (i), (ii), (iii) or (iv) above, a
Distribution Date (as defined in the Rights Agreement) will not occur, no
ATL Rights will separate from the shares of ATL Common Stock or otherwise
become exercisable and no adjustment will be made pursuant to Section 12 of
the Rights Agreement.

     The foregoing description of the Amendment is qualified in its
entirety by reference to the full text of the Amendment, which is attached
hereto as Exhibit A and is incorporated herein by reference, and to the
Rights Agreement which was attached as an exhibit to Amendment Number 3 to
the Form 8-A filed on June 26, 1992 and which is incorporated herein by
reference.







ITEM 2.  EXHIBITS.


          Exhibit No.         Description

          4.1(a)*             Amended and Restated Rights Agreement dated 
                              as June 26, 1992, between Advanced Technology 
                              Laboratories, Inc. (formerly known as 
                              Westmark International Incorporated) and 
                              First Chicago Trust Company of New York, as 
                              Rights Agent, which includes the Certificate 
                              of Designation for the Series A Participating 
                              Cumulative Preferred Stock as Exhibit A and 
                              the form of Right Certificate as Exhibit B.

          4.1(b)              Amendment to the Amended and Restated Rights 
                              Agreement dated as of July 29, 1998.

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[* Incorporated by reference to Exhibit 4.1 to Form 10-K dated December 31, 
1997, File No. 0-15160.]







                                 SIGNATURE

     Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the registrant has duly caused this registration statement to
be signed on its behalf by the undersigned hereunto duly authorized.


Date:  August 4, 1998         ATL ULTRASOUND, INC.
                              (Registrant)



                              By:    /s/ Dennis C. Fill
                              Name:  Dennis C. Fill
                              Title: Chairman and Chief Executive Officer





                               EXHIBIT INDEX


          Exhibit No.         Description

          4.1(a)*             Amended and Restated Rights Agreement dated
                              as June 26, 1992, between Advanced Technology
                              Laboratories, Inc. (formerly known as 
                              Westmark International Incorporated) and
                              First Chicago Trust Company of New York, as
                              Rights Agent, which includes the Certificate
                              of Designation for the Series A Participating
                              Cumulative Preferred Stock as Exhibit A and
                              the form of Right Certificate as Exhibit B.

          4.1(b)              Amendment to the Amended and Restated Rights
                              Agreement dated as of July 29, 1998.

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[* Incorporated by reference to Exhibit 4.1 to Form 10-K dated December 31, 
1997, File No. 0-15160.]