Home1989 Treaties and Agreements ...Cameroon (89-406) – Treaty Concerning the Encouragement and Protection of Investment hide Cameroon (89-406) – Treaty Concerning the Encouragement and Protection of Investment TIAS Office of Treaty Affairs April 6, 1989 Share Share this page on: Close Trade and Investment Treaty signed at Washington on February 26, 1985 with annex. Entered into force April 6, 1989. Download attachment [17 MB] Tags Cameroon Trade and Investment Treaties