| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRALIA | Accession | 27/09/1973 | |
| AUSTRIA | Accession | 09/01/1957 | |
| Bahamas | Extension | 22/10/1951 | |
| Barbados | Extension | 15/12/1950 | |
| BELGIUM | Signature | 10/05/1948 | |
| BELGIUM | Ratification | 20/07/1951 | |
| BRAZIL | Accession | 05/11/1970 | |
| British Guiana | Extension | 15/12/1950 | |
| British Honduras | Extension | 15/12/1950 | |
| Brunei | Extension | 15/12/1950 | |
| BULGARIA | Accession | 31/03/1960 | |
| BYELORUSSIA S S R | Accession | 30/03/1960 | |
| CANADA | Accession | 08/11/1957 | |
| Cyprus | Extension | 17/04/1951 | |
| CZECHOSLOVAKIA | Accession | 01/04/1960 | |
| DENMARK | Signature | 05/05/1948 | |
| DENMARK | Ratification | 05/05/1949 | |
| Falkland Islands | Extension | 15/12/1950 | |
| Fiji | Extension | 15/12/1950 | |
| FINLAND | Signature | 10/05/1948 | |
| FINLAND | Ratification | 01/10/1953 | |
| FRANCE | Signature | 05/05/1948 | |
| FRANCE | Ratification | 20/06/1949 | |
| GERMANY FEDERAL REPUBLIC | Accession | 16/03/1957 | |
| Gibraltar | Extension | 15/12/1950 | |
| Gold Coast | Extension | 15/12/1950 | |
| GREECE | Signature | 10/05/1948 | |
| GREECE | Ratification | 06/05/1953 | |
| HAITI | Signature | 10/05/1948 | |
| HAITI | Ratification | 18/08/1951 | |
| Hong Kong | Extension | 15/12/1950 | |
| HUNGARY | Accession | 01/04/1960 | |
| ISRAEL | Accession | 31/05/1952 | |
| ITALY | Signature | 10/05/1948 | |
| ITALY | Ratification | 26/12/1952 | |
| Jamaica | Extension | 17/04/1951 | |
| JAPAN | Accession | 08/01/1965 | |
| LEBANON | Signature | 10/04/1948 | |
| LEBANON | Ratification | 09/09/1953 | |
| Leeward Islands | Extension | 15/12/1950 | |
| Malay States, Unfederated | Extension | 15/12/1950 | |
| Malta | Extension | 15/12/1950 | |
| Mauritius | Extension | 15/12/1950 | |
| MONACO | Accession | 29/04/1958 | |
| MOROCCO | Signature | 10/05/1948 | |
| MOROCCO | Ratification | 20/07/1955 | |
| NETHERLANDS THE | Accession | 08/01/1951 | |
| Netherlands West Indies | Extension | 15/12/1950 | |
| NEW ZEALAND | Accession | 12/07/1950 | |
| Nigeria | Extension | 15/12/1950 | |
| NIGERIA | Accession | 02/01/1963 | |
| North Borneo | Extension | 15/12/1950 | |
| Northern Rhodesia | Extension | 15/12/1950 | |
| NORWAY | Signature | 10/04/1948 | |
| NORWAY | Ratification | 25/11/1949 | |
| Nyasaland | Extension | 15/12/1950 | |
| PHILIPPINES | Accession | 12/08/1993 | |
| POLAND | Accession | 04/04/1960 | |
| PORTUGAL | Signature | 10/05/1948 | |
| PORTUGAL | Ratification | 10/08/1955 | |
| ROMANIA | Accession | 01/04/1960 | |
| Sarawak | Extension | 15/12/1950 | |
| Seychelles | Extension | 15/12/1950 | |
| Sierra Leone | Extension | 15/12/1950 | |
| Singapore | Extension | 15/12/1950 | |
| SLOVAK REPUBLIC | Accession | 08/07/1993 | |
| SOLOMON ISLANDS | Withdrawal | 01/01/1905 | |
| Somaliland Protectorate | Extension | 15/12/1950 | |
| SOUTH AFRICA | Accession | 01/09/1993 | |
| SOVIET UNION | Accession | 09/06/1959 | |
| SPAIN | Accession | 03/11/1971 | 01/12/1971 |
| St Helena | Extension | 15/12/1950 | |
| SWEDEN | Signature | 10/05/1948 | |
| SWEDEN | Ratification | 19/04/1950 | |
| SWITZERLAND | Signature | 10/05/1948 | |
| SWITZERLAND | Ratification | 23/04/1951 | |
| Tanganyika | Extension | 15/12/1950 | |
| TANGANYIKA | Accession | 26/03/1963 | |
| The Gambia | Extension | 15/12/1950 | |
| Trinidad And Tobago | Extension | 15/12/1950 | |
| TUNISIA | Accession | 20/07/1955 | |
| Uganda | Extension | 15/12/1950 | |
| UKRAINE S S R | Accession | 30/03/1960 | |
| UNITED KINGDOM | Ratification | 02/09/1949 | |
| UNITED KINGDOM | Accession | 02/09/1949 | |
| UNITED KINGDOM | Declaration | 15/12/1950 | |
| UNITED KINGDOM | Declaration | 17/04/1951 | |
| UNITED KINGDOM | Declaration | 22/10/1951 | |
| UNITED STATES OF AMERICA | Accession | 24/05/1968 | |
| Western Pacific High Commsn Territories | Extension | 15/12/1950 | |
| Windward Islands | Extension | 15/12/1950 | |
| Zanzibar | Extension | 15/12/1950 |