Exhibit 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our reports included or incorporated by reference in this Form 10-K, into the Company's previously filed Registration Statements on Form S-8 (registration nos. 33-7201, 33-17447, 33-26733, 33-35936, 33-63702, 33-64266, 33-62285, 33- 64427, 33-64431 and 333-01325), previously filed Registration Statement on Form S-3 (registration no. 333-6879) and previously filed Registration Statement on Form S-4 (registration no. 33-56891). /s/ Arthur Andersen LLP ARTHUR ANDERSEN LLP Chicago, Illinois March 26, 1997