WASHINGTON, DC 20549

                                 SCHEDULE 13G
                                (Rule 13d-102)

                           PURSUANT TO RULE 13d-2(b)

                              (Amendment No._____)(1)

                             Esco Technologies Inc.
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                                (Name of Issuer)

                                  Common Stock
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                         (Title of Class of Securities)

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                                 (CUSIP Number)

                               December 31, 2001
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            (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)

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(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

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!

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).

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."

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).