Exhibit 10.18 AGREEMENT TO EXTEND SENIOR SECURED CONVERTIBLE DEBENTURE Come now Hyde Investments Ltd., ("Holder"), National Parking Systems, Inc., ABS Holding Company, Inc., BH Holding Company, Inc. and Marc Ebersole (hereinafter collectively referred...Senior Secured Convertible Debenture Extension • November 21st, 2005 • Biostem, Inc. • Services-business services, nec
