International Brokerage and Finance S.A. and Usinas Siderurgicas de Minas Gerais S.A. 30 September 1993 - World Trade and Arbitration Materials View International Brokerage and Finance S.A. and Usinas Siderurgicas de Minas Gerais S.A. 30 September 1993 by - World Trade and Arbitration Materials International Brokerage and Finance S.A. and Usinas Siderurgicas de Minas Gerais S.A. 30 September 1993 6 4 World Trade and Arbitration Materials