Exhibit 24
POWER OF ATTORNEY
KNOW ALL MEN BY THESE PRESENTS, that each of the undersigned directors and officers of
Parker-Hannifin Corporation, an Ohio corporation (the “Company”), hereby constitutes and
appoints Donald E. Washkewicz, Timothy K. Pistell, Thomas A. Piraino, Jr., Pamela J. Huggins and
Patrick J. Leddy, and each of them, as the true and lawful attorney-in-fact or attorneys-in-fact,
with full power of substitution and resubstitution, for each of the undersigned and in the name,
place and stead of each of the undersigned, to sign and file with the Securities and Exchange
Commission under the Securities Act of 1933 (the “Securities Act”) one or more
post-effective amendment(s) to the registration statement on Form S-3 (File No. 333-82806) (the
“Registration Statement”), with any and all amendments, supplements and exhibits thereto,
or any additional registration statement filed pursuant to Rule 462 promulgated under the
Securities Act, or any other document with any state securities commission or other regulatory
authority with respect to the securities covered by the Registration Statement, with full power and
authority to do and perform any and all acts and things whatsoever required, necessary or desirable
to be done in the premises, hereby ratifying and approving the act of said attorneys and any of
them and any such substitute.
This Power of Attorney may be executed in multiple counterparts, each of which shall be deemed
an original with respect to the person executing it.
Executed as of this 1st day of June 2007.
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/s/ Donald E. Washkewicz
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/s/ Giulio Mazzalupi |
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Donald E. Washkewicz
Chairman, President and Chief Executive Officer
(Principal Executive Officer)
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Giulio Mazzalupi
Director |
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/s/ Timothy K. Pistell
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/s/ Klaus-Peter Müller |
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Timothy K. Pistell
Executive Vice President — Finance and
Administration and Chief Financial Officer
(Principal Financial Officer)
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Klaus-Peter Müller
Director |
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/s/ Dana A. Dennis
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/s/ Candy M. Obourn |
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Dana A. Dennis
Vice President and Controller
(Principal
Accounting Officer)
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Candy M. Obourn
Director |
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/s/ Linda S. Harty
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/s/ Joseph M. Scaminace |
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Linda S. Harty
Director
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Joseph M. Scaminace
Director |
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/s/ William E. Kassling
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/s/ Wolfgang R. Schmitt |
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William E. Kassling
Director
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Wolfgang R. Schmitt
Director |
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/s/ Robert J. Kohlhepp
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/s/ Markos I. Tambakeras |
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Robert J. Kohlhepp
Director
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Markos I. Tambakeras
Director |