SIGNATURE JOINDER AGREEMENTSignature Joinder Agreement • July 8th, 2005 • Barth Bruce • Surgical & medical instruments & apparatus
Pursuant to the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required on Amendment No. 1 to Schedule 13D need be filed with respect to ownership by each of the undersigned of shares of common stock of Optical Sensors Incorporated.
