Home1998 Treaties and Agreements ...Mexico (13009) – Memorandum of Understanding Concerning the Use of Radio Frequencies, Coordination and Cooperation for Emergency Purposes hide Mexico (13009) – Memorandum of Understanding Concerning the Use of Radio Frequencies, Coordination and Cooperation for Emergency Purposes TIAS Office of Treaty Affairs December 9, 1998 Telecommunications Memorandum of understanding signed at Washington and Mexico City December 9, 1998; Entered into force December 9, 1998. With annexes. Download attachment [1 MB] Tags Mexico Telecommunications Treaties