Exhibit 23.1 Consent of Wipfli Ullrich Bertelson LLP CONSENT OF INDEPENDENT ACCOUNTANTS We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Marathon Electric Hourly 401(k) Savings Plan of our report dated August 28, 1997, with respect to the financial statements and schedules of the Plan included in the Annual Report for the year ended December 31, 1996. Wipfli Ullrich Bertelson LLP ---------------------------- Wipfli Ullrich Bertelson LLP March 27, 1998 Wausau, Wisconsin