Exhibit 4.1 NBD Bank 28660 Northwestern Highway Southfield, Michigan 48034 Telephone: (248) 799-5817 Fax: (248) 799-5826 Robert B. Greene First Vice President July 29, 1997 Mr. Alan S. Ker Chief Financial Officer Universal Standard Medical...Revolving Credit and Loan Agreement • August 15th, 1997 • Universal Standard Medical Laboratories Inc • Services-medical laboratories
