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| Entry into force: | 30 August 1930. |
| Registration: | 22 February 1931, No. 26241. |
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| Austria | (June 25th, 1931) |
| Brazil | (July 1st, 1938 a) |
| Bulgaria | (May 22nd, 1930) |
| Colombia | (May 9th, 1932) |
| Cuba | (June 13th, 1933) |
| Czechoslovakia 2 | (September 12th, 1931) |
| Estonia | (August 30th, 1930 a) |
| Finland | (September 25th, 1936 a) |
| Greece | (May 19th, 1931) |
| Latvia | (July 22nd, 1939 a) |
| Poland | (June 15th, 1934) |
| Portugal | (September 18th, 1930) |
| Romania | (November 10th, 1930) |
| Spain | (April 28th, 1930) |
| Yugoslavia (former)3 | (November 24th, 1930) |
| Panama |
| Participant4 | Accession (a), Succession (d) |
| Algeria | 17 Mar 1965 a |
| Burkina Faso | 8 Dec 1964 a |
| Côte d'Ivoire | 25 May 1964 a |
| Cyprus | 10 Jun 1965 a |
| Czech Republic2 | 9 Feb 1996 d |
| Gabon | 11 Aug 1964 a |
| Ghana | 9 Jul 1964 a |
| Iraq | 14 May 1965 a |
| Israel | 10 Feb 1965 a |
| Liberia | 16 Sep 2005 a |
| Lithuania | 2 Apr 2004 a |
| Malawi | 18 Nov 1965 a |
| Niger | 5 May 1969 a |
| Senegal | 25 Aug 1965 a |
| Slovakia2 | 28 May 1993 d |
| Slovenia | 9 May 2006 d |
| Sri Lanka | 2 Jun 1967 a |
| Sweden | 15 Mar 2001 a |
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1. League of Nations, Treaty Series, vol. 112, p. 395.
2. See note 1 under "Czech Republic" and note 1 under "Slovakia" in the "Historical Information" section in the front matter of this volume.
3. See note 1 under "former Yugoslavia" in the "Historical Information" section in the front matter of this volume
4. The Republic of Viet-Nam had acceded to the Protocol on 3 December 1964. See also note 1 under "Viet nam" in the "Historical Information" section in the front matter of this volume.