EXHIBIT 4.3 ----------- QUESTAR INVESTOR RIGHTS AGREEMENT QUESTAR INVESTOR RIGHTS AGREEMENT (this "Agreement"), dated as of May 31, 2006, by and among Touchstone Applied Science Associates, Inc., a Delaware corporation (the "Company"), and the...Questar Investor Rights Agreement • June 6th, 2006 • Touchstone Applied Science Associates Inc /Ny/ • Services-educational services • New York
