Home1989 Treaties and Agreements ...Philippines (89-1109) – Understanding Concerning Principles and Procedures for the Expansion of Trade and Investment hide Philippines (89-1109) – Understanding Concerning Principles and Procedures for the Expansion of Trade and Investment TIAS Office of Treaty Affairs November 9, 1989 Trade and Investment Understanding signed at Washington November 9, 1989; entered into force November 9, 1989. Download attachment [2 MB] Tags Philippines Trade and Investment Treaties