UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES
FORM 3
OMB APROVAL
OMB NUMBER: 3235-0104
Expires: December 31, 2001
Estimated average burden
hours per response........0.5
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section
17(a) of the Public Utility Holding Company Act of 1935
or Section 30(f) of the Investment Company Act of 1940
(Print or Type Responses)
1. Name and Address of Reporting Person*
Emerson Electric Co.(1)
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(Last) (First) (Middle)
8000 W. Florissant Avenue
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(Street)
St. Louis MO 63136
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(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
01/31/02
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3. IRS or Social Security Number of Reporting Person (Voluntary)
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4. Issuer Name and Ticker or Trading Symbol
MKS Instruments, Inc. (MKSI)
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5. Relationship of Reporting Person to Issuer (Check all applicable)
Director X 10% Owner
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Officer (give title below) Other (specify below)
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6. If Amendment, Date of Original (Month/Day/Year)
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7. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
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X Form filed by More than One Reporting Person
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Table I Non-Derivative Securities Beneficially Owned
1. Title of Security 2. Amount of Securities 3. Ownership 4. Nature of Indirect
(Instr. 4) Beneficially Owned Form: Direct Beneficial Ownership
(Instr. 4) (D) or Indirect (Instr. 5)
(I)(Instr. 5)
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Common Stock 3,036,611 D
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Common Stock 8,963,389 I(2) Through a Subsidiary
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* If the form is filed by more than one reporting person, see Instruction
5(b)(v).
Reminder: Report on a separate line for each class of securities beneficially
owned directly or indirectly. Page 1 of 3 (Over)
SEC 1473 (3-99)
Table II Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative 2. Date Exercisable 3. Title and Amount of 4. Conver- 5. Owner- 6. Nature
Security (Instr. 4) and Expiration Securities Underlying sion or ship of In-
Date (Month/Day/ Year) Derivative Securities Exercise Form of direct
------------------------- (Instr. 4) Price of Deriv- Bene-
Date Expira- ------------------------- Derivative ative ficial
Exer- tion Title Amount Security Security: Owner-
cisable Date or Direct ship
Number (D) or (Instr.
of Indirect 5)
Shares (I)
(Instr.
5)
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Explanation of Responses:
(1) Please see attached Joint Filer Information.
(2) The reported securities are owned directly by Astec America, Inc. The
Reporting Person is the ultimate parent company of Astec America, Inc.
/s/ Harley M. Smith
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**Signature of Reporting Person
By: Harley M. Smith, Assistant Secretary
/s/ David C. Moon
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**Signature of Reporting Person
By: David C. Moon, as Vice President of
Astec America, Inc.
02/07/02
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Date
**Intentional misstatements or omissions of facts constitute Federal Criminal
Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed.
If space is insufficient, see Instruction 6 for procedure.
Potential persons who are to respond to the collection of information
contained in this form are not required to respond unless the form displays Page 2 of 3
a currently valid OMB Number. SEC 1473 (3-99)
Joint Filer Information
Astec America Inc., 5810 Van Allen Way, Carlsbad, California 92008, has
designated Emerson Electric Co. as the "Designated Filer" for the purposes of
the attached Form 3.
Issuer & Ticker Symbol: MKS Instruments, Inc. (MKSI)
Date of Event Requiring Statement: 01/31/02
Signature: /s/ Harley M. Smith
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By: Harley M. Smith, Assistant Secretary of
Emerson Electric Co.
Signature: /s/ David C. Moon
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By: David C. Moon, as Vice President of Astec America, Inc.
Page 3 of 3
