EXHIBIT 4 SERIES B CONVERTIBLE PREFERRED STOCK AND WARRANT PURCHASE AGREEMENT THIS SERIES B CONVERTIBLE PREFERRED STOCK AND WARRANT PURCHASE AGREEMENT (this "Agreement") is made and entered into effective as of March 4, 2004, by and among...Series B Convertible Preferred Stock and Warrant Purchase Agreement • May 17th, 2004 • Trans Industries Inc • Miscellaneous manufacturing industries • Ohio
