| Country | Action | Action Date | Effective Date |
|---|
| Antilles | Extension | | 01/01/1986 |
| Aruba | Extension | | 01/01/1986 |
| BELGIUM | Definitive Signature | 05/03/1956 | |
| CANADA | Definitive Signature | 05/07/1956 | |
| DENMARK | Definitive Signature | 19/01/1956 | |
| FINLAND | Acceptance | 17/02/1972 | |
| FRANCE | Definitive Signature | 06/01/1956 | |
| GERMANY FEDERAL REPUBLIC | Acceptance | 09/07/1958 | |
| GREECE | Definitive Signature | 23/02/1956 | |
| ISRAEL | Acceptance | 14/03/1968 | |
| ITALY | Definitive Signature | 16/03/1956 | |
| JAPAN | Acceptance | 18/11/1959 | |
| Land Berlin | Extension | 09/07/1958 | |
| LIBERIA | Acceptance | 23/04/1958 | |
| NETHERLANDS THE | Definitive Signature | 17/02/1956 | |
| NORWAY | Definitive Signature | 10/01/1956 | |
| PANAMA | Acceptance | 31/08/1959 | |
| POLAND | Acceptance | 22/04/1975 | |
| SPAIN | Acceptance | 03/02/1958 | |
| SWEDEN | Definitive Signature | 18/01/1956 | |
| UNITED KINGDOM | Signature | 09/02/1956 | |
| UNITED KINGDOM | Definitive Signature | 09/02/1956 | |
| UNITED STATES OF AMERICA | Definitive Signature | 04/01/1956 | |
| YUGOSLAVIA | Acceptance | 14/02/1958 | |