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 registration
statement(s) on Form S-3 (the “Registration Statement”) relating to the registration of
certain securities of the Company, with any and all amendments, supplements and exhibits thereto,
including post-effective amendments or supplements, whether on Form S-3 or otherwise, 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 17th day of April 2007.
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/s/ Donald E. Washkewicz
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/s/ Giulio Mazzalupi |
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Donald E. Washkewicz
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Giulio Mazzalupi |
Chairman, President and Chief Executive Officer
(Principal Executive Officer)
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Director |
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/s/ Timothy K. Pistell
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/s/ Klaus-Peter Müller |
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Timothy K. Pistell
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Klaus-Peter Müller |
Executive Vice President — Finance and
Administration and Chief Financial Officer
(Principal Financial Officer )
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Director |
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/s/ Dana A. Dennis
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/s/ Candy M. Obourn |
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Dana A. Dennis
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Candy M. Obourn |
Vice President and Controller (Principal
Accounting Officer)
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Director |
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/s/ Linda S. Harty
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/s/ Joseph M. Scaminace |
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Linda S. Harty
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Joseph M. Scaminace |
Director
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Director |
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/s/ William E. Kassling
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/s/ Wolfgang R. Schmitt |
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William E. Kassling
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Wolfgang R. Schmitt |
Director
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Director |
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/s/ Robert J. Kohlhepp
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/s/ Markos I. Tambakeras |
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Robert J. Kohlhepp
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Markos I. Tambakeras |
Director
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Director |