FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  KLA TENCOR CORP
 2. Date of Event Requiring Statement (Month/Day/Year)
02/22/2006		 3. Issuer Name and Ticker or Trading Symbol
ADE CORP [ADEX]
(Last)
(First)
(Middle)
160 RIO ROBLES		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See remarks below
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN JOSE, CA 95134		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
KLA TENCOR CORP
160 RIO ROBLES
SAN JOSE, CA 95134		       See remarks below

Signatures

/s/ Stuart J. Nichols, Vice President and General Counsel 03/06/2006
**Signature of Reporting Person Date

Explanation of Responses:

No securities are beneficially owned

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
 
Remarks:
KLA-Tencor Corporation ("KLA"), ADE Corporation ("ADE") and a wholly-owned subsidiary of KLA ("Merger Corp.")
entered into an Agreement and Plan of Merger, dated as of February 22, 2006 (the "Merger Agreement"), pursuant to
which ADE will merge with Merger Corp. (the "Merger"). Certain officers and directors of ADE (the "Stockholders")
entered into voting agreements (the "Voting Agreements"), pursuant to which the Stockholders agreed to vote their shares
of common stock of ADE in favor of the Merger and the Merger Agreement.  KLA has no pecuniary interest in the shares held by the Stockholders.
KLA expressly disclaims beneficial ownership of any shares covered by the Voting Agreements.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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