To Whom It May Concern:

I, Robert F. Hawthorne, hereby appoint James J. Seifert, Gene C.
Wulf and Stanley A. Jaffy, each and individually, my true and
lawful attorney-in-fact, for and in my name, place and stead,
with full power of substitution, to sign on my behalf any and
all Forms 3, 4 and 5 for the submission of such forms to the
Securities and Exchange Commission, and to take any and all
actions necessary or advisable to file such Forms with the
Securities and Exchange Commission.

IN WITNESS WHEREOF, the undersigned has caused these presents to
be executed on the 2nd day of August 2007.


/s/ Robert F. Hawthorne
Robert F. Hawthorne




Signed or attested before me on the 2nd day of August 2007 by
Robert F. Hawthorne.


/s/ Claudia Monroe
Notary Public

Claudia Monroe, Notary Public
State of Wisconsin
My Commission Expires October 12, 2008