| Country | Date of Signature | Date of Deposit of Ratification | Date of Deposit of Accession |
|---|---|---|---|
| Argentina | 12/01/59 | 06/23/61 | -------- |
| Australia | 12/01/59 | 06/23/61 | -------- |
| Austria | -------- | -------- | 08/25/87 |
| Belgium | 12/01/59 | 07/26/60 | -------- |
| Brazil | -------- | -------- | 05/16/75 |
| Bulgaria | -------- | -------- | 09/11/78 |
| Chile | 12/01/59 | 06/23/61 | -------- |
| China | -------- | -------- | 06/08/83 |
| Cuba | -------- | -------- | 08/16/84 |
| Czechoslovakia | -------- | -------- | 06/14/62 |
| Denmark | -------- | -------- | 05/20/65 |
| Ecuador | -------- | -------- | 09/15/87 |
| Finland | -------- | -------- | 05/15/84 |
| France | 12/01/59 | 09/16/60 | -------- |
| German Democratic Republic | -------- | -------- | 11/19/74 |
| Germany, Federal Republic of | -------- | -------- | 02/05/79 |
| Greece | -------- | -------- | 01/08/87 |
| Hungary | -------- | -------- | 01/27/84 |
| India | -------- | -------- | 08/19/83 |
| Italy | -------- | -------- | 03/18/81 |
| Japan | 12/01/59 | 08/04/60 | -------- |
| Korea, Democratic Peoples Republic of | -------- | -------- | 01/21/87 |
| Korea, Republic of | -------- | -------- | 11/28/86 |
| Netherlands | -------- | -------- | 03/30/67 |
| New Zealand | 12/01/59 | 11/01/60 | -------- |
| Norway | 12/01/59 | 08/24/60 | -------- |
| Papua New Guinea | -------- | -------- | 03/16/81 |
| Peru | -------- | -------- | 04/10/81 |
| Poland | -------- | -------- | 06/08/61 |
| Romania | -------- | -------- | 09/15/71 |
| South Africa | 12/01/59 | 06/21/60 | -------- |
| Spain | -------- | -------- | 03/31/82 |
| Sweden | -------- | -------- | 04/24/84 |
| Union of Soviet Socialist Republics | 12/01/59 | 11/02/60 | -------- |
| United Kingdom | 12/01/59 | 05/31/60 | -------- |
| United States | 12/01/59 | 08/18/60 | -------- |
| Uruguay | -------- | -------- | 01/11/80 |
| Total | 12 | 12 | 25 |