SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                 SCHEDULE 13G
                                (Rule 13d-102)


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d-1(b)(c), AND (d) AND AMENDMENTS THERETO FILED
                           PURSUANT TO RULE 13d-2(b)

                              (Amendment No._____)(1)


                             Esco Technologies Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    29631510
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                               December 31, 2001
--------------------------------------------------------------------------------
            (Date of Event Which Requires Filing of this Statement)


     Check the  appropriate  box to  designate  the rule  pursuant to which this
Schedule is filed:

          [X]  Rule 13d-1(b)

          [_]  Rule 13d-1(c)

          [_]  Rule 13d-1(d)


----------
(1)  The  remainder  of this  cover  page  shall be filled  out for a  reporting
     person's  initial  filing on this form with respect to the subject class of
     securities,  and for any subsequent amendment containing  information which
     would alter the disclosures provided in a prior cover page.

     The  information  required in the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 or otherwise  subject to the  liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).




<PAGE>

CUSIP No. 29631510                    13G                      Page 2 of 5 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)


     Credit Suisse Asset Management, LLC                              13-3580284
________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [_]
     Not applicable
________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION


     United States
________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER
                    
   SHARES           716,476
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER
                    
  OWNED BY          0
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER
                    
  REPORTING         716,476
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER
                    
    WITH            0
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


     716,476
________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]
     Not applicable
________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


     5.8%
________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*


     IA
________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>


CUSIP No. 29631510                    13G                      Page 3 of 5 Pages



Item 1(a).  Name of Issuer:


            Esco Technologies Inc.
            ____________________________________________________________________

Item 1(b).  Address of Issuer's Principal Executive Offices:


            8888 Ladue Road, Suite 200, St. Louis, MO 63124-2090
            ____________________________________________________________________

Item 2(a).  Name of Person Filing:


            Credit Suisse Asset Management, LLC
            ____________________________________________________________________

Item 2(b).  Address of Principal Business Office, or if None, Residence:


            466 Lexington Avenue, New York, New York 10017
            ____________________________________________________________________

Item 2(c).  Citizenship:


            United States
            ____________________________________________________________________

Item 2(d).  Title of Class of Securities:


            Common Stock
            ____________________________________________________________________

Item 2(e).  CUSIP Number:


            29631510
            ____________________________________________________________________

Item 3.     If This Statement  is Filed  Pursuant to  Rule 13d-1(b), or 13d-2(b)
            or (c), Check Whether the Person Filing is a:

     (a)  [_]  Broker or dealer registered under Section 15 of the Exchange Act.

     (b)  [_]  Bank as defined in Section 3(a)(6) of the Exchange Act.

     (c)  [_]  Insurance  company as defined in Section 3(a)(19) of the Exchange
               Act.

     (d)  [_]  Investment  company  registered under Section 8 of the Investment
               Company Act.

     (e)  [X]  An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

     (f)  [_]  An employee  benefit plan or endowment  fund in  accordance  with
               Rule 13d-1(b)(1)(ii)(F);

     (g)  [_]  A parent  holding  company or control  person in accordance  with
               Rule 13d-1(b)(1)(ii)(G);

     (h)  [_]  A savings  association  as defined in Section 3(b) of the Federal
               Deposit Insurance Act;

     (i)  [_]  A  church  plan  that  is  excluded  from  the  definition  of an
               investment  company  under  Section  3(c)(14)  of the  Investment
               Company Act;

     (j)  [_]  Group, in accordance with Rule 13d-1(b)(1)(ii)(J).



<PAGE>


CUSIP No. 29631510                    13G                      Page 4 of 5 Pages


Item 4.  Ownership.

     Provide  the  following  information  regarding  the  aggregate  number and
percentage of the class of securities of the issuer identified in Item 1.

     (a)  Amount beneficially owned: 716,476

          ______________________________________________________________________

     (b)  Percent of class: 5.8%

          ______________________________________________________________________

     (c)  Number of shares as to which such person has:

          (i)   Sole power to vote or to direct the vote 716,476


          (ii)  Shared power to vote or to direct the vote 0


          (iii) Sole power to dispose or to direct the disposition of 716,476


          (iv)  Shared power to dispose or to direct the disposition of 0



Item 5.  Ownership of Five Percent or Less of a Class.

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities check the following [ ].

         Not applicable
         _______________________________________________________________________

Item 6.  Ownership of More Than Five Percent on Behalf of Another Person.


         Not applicable
         _______________________________________________________________________

Item 7.  Identification and  Classification of the Subsidiary Which Acquired the
         Security  Being  Reported on by the Parent  Holding  Company or Control
         Person.


         Not applicable
         _______________________________________________________________________

Item 8.  Identification  and  Classification  of Members of the Group. 


         Not applicable
         _______________________________________________________________________

Item 9.  Notice of Dissolution of Group.


         Not applicable
         _______________________________________________________________________

Item 10.  Certifications.

     (a)  The  following  certification  shall be included if the  statement  is
          filed pursuant to Rule 13d-1(b):

          "By signing  below I certify  that,  to the best of my  knowledge  and
          belief, the securities referred to above were acquired and are held in
          the ordinary course of business and were not acquired and not held for
          the  purpose  of or with the effect of  changing  or  influencing  the
          control of the issuer of the  securities and were not acquired and are
          not held in  connection  with or as a participant  in any  transaction
          having such purpose or effect."


    

<PAGE>


                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.


                                        February 5, 2002
                                        ----------------------------------------
                                                        (Date)


                                        /s/ Hal Liebes
                                        ----------------------------------------
                                                      (Signature)


                                        Hal Liebes, Mgng Director & Genl Counsel
                                        ----------------------------------------
                                                      (Name/Title)



Note.  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
for whom copies are to be sent.

Attention.  Intentional  misstatements  or omissions of fact constitute  federal
criminal violations (see 18 U.S.C. 1001).