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, Jon
P. Marten 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 12th day of August 2010.
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/s/ Donald E. Washkewicz
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/s/ Klaus-Peter Müller |
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Donald E. Washkewicz
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Klaus-Peter Müller |
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Chairman, President and Chief Executive Officer
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Director |
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(Principal Executive Officer) |
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/s/ Timothy K. Pistell
Timothy K. Pistell
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/s/ Candy M. Obourn
Candy M. Obourn
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Executive Vice President — Finance and
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Director |
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Administration and Chief Financial Officer |
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(Principal Financial Officer ) |
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/s/ Jon P. Marten
Jon P. Marten
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/s/ Joseph M. Scaminace
Joseph M. Scaminace
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Vice President and Controller
(Principal Accounting Officer)
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Director |
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/s/ Linda S. Harty
Linda S. Harty
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/s/ Wolfgang R. Schmitt
Wolfgang R. Schmitt
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Director
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Director |
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/s/ William E. Kassling
William E. Kassling
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/s/ Markos I. Tambakeras
Markos I. Tambakeras
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Director
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Director |
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/s/ Robert J. Kohlhepp
Robert J. Kohlhepp
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/s/ James L. Wainscott
James L. Wainscott
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Director
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Director |
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/s/ Giulio Mazzalupi
Giulio Mazzalupi
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Director |
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