Notice hereunder shall be deemed to have been duly given if in writing and delivered in person or by registered or certified mail, postage prepaid, return receipt requested, if to the Company, at its office at 6431 West Oakton, Morton Grove, IL 60053, or if to the Seller, at the address set forth on the signature page hereto (or at such other addresses as the parties may notify each other in accordance with the provisions of this Section 7).