Vitro Flex S.A. and Cristales Inastillables de Mexico S.A. v. United States, PPG Industries, Inc. L-N Safety Glass, S.A. de C.V. 30 May 1989 - World Trade and Arbitration Materials View Vitro Flex S.A. and Cristales Inastillables de Mexico S.A. v. United States, PPG Industries, Inc. L-N Safety Glass, S.A. de C.V. 30 May 1989 by - World Trade and Arbitration Materials Vitro Flex S.A. and Cristales Inastillables de Mexico S.A. v. United States, PPG Industries, Inc. L-N Safety Glass, S.A. de C.V. 30 May 1989 1 5 World Trade and Arbitration Materials