04-HP-876_10K.qxd 12/15/04 2:43 PM Page 24 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Company has duly caused this Repor to be signed on its behalf by the undersigned, thereunto duly authorized: Pursuant to the requirements of the Securities Exchange Act of 1934, this Report has been signed below by the following persons on behalf of the Company and in the capacities and on the dates indicated: SIGNATURES HELMERICH & PAYNE, INC. By /s/ William L. Armstrong William L. Armstrong, Director Date: December 13, 2004 By /s/ Glenn A. Cox Glenn A. Cox, Director Date: December 13, 2004 By /s/ Hans Helmerich Hans Helmerich, Director and CEO Date: December 13, 2004 By /s/ L. F. Rooney, III L. F. Rooney, III, Director Date: December 13, 2004 By  /s/ George S. Dotson George S. Dotson, Director Date: December 13, 2004 By  /s/ W.H. Helmerich, III W. H. Helmerich, III, Director Date: December 13, 2004 Edward B. Rust, Jr., Director Date: December 13, 2004 By  /s/ Edward B. Rust, Jr. John D. Zeglis, Director Date: December 13, 2004 By  /s/ John D. Zeglis Paula Marshall-Chapman, Director Date: December 13, 2004 By /s/ Paula Marshall-Chapman Douglas E. Fears, (Principal Financial Officer) Date: December 13, 2004 By /s/ Douglas E. Fears Gordon K. Helm, Controller (Principal Accounting Officer) Date: December 13, 2004 By  /s/ Gordon K. Helm Hans Helmerich, President and Chief Executive Officer Date: December 13, 2004 By /s/ Hans Helmerich 21