| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 23/10/1954 | |
| BELGIUM | Acceptance | 22/04/1955 | |
| CANADA | Signature | 23/10/1954 | |
| CANADA | Acceptance | 29/04/1955 | |
| DENMARK | Signature | 23/10/1954 | |
| DENMARK | Acceptance | 23/04/1955 | |
| FRANCE | Signature | 23/10/1954 | |
| FRANCE | Acceptance | 05/05/1955 | |
| GERMANY FEDERAL REPUBLIC | Signature | 23/10/1954 | |
| GERMANY FEDERAL REPUBLIC | Acceptance | 06/05/1955 | |
| GREECE | Signature | 23/10/1954 | |
| GREECE | Acceptance | 18/04/1955 | |
| ICELAND | Signature | 23/10/1954 | |
| ICELAND | Acceptance | 16/03/1955 | |
| ITALY | Signature | 23/10/1954 | |
| ITALY | Acceptance | 20/04/1955 | |
| LUXEMBOURG | Signature | 23/10/1954 | |
| LUXEMBOURG | Acceptance | 03/05/1955 | |
| NETHERLANDS THE | Signature | 23/10/1954 | |
| NETHERLANDS THE | Acceptance | 30/04/1955 | |
| NORWAY | Signature | 23/10/1954 | |
| NORWAY | Acceptance | 18/04/1955 | |
| PORTUGAL | Signature | 23/10/1954 | |
| PORTUGAL | Acceptance | 26/04/1955 | |
| TURKEY | Signature | 23/10/1954 | |
| TURKEY | Acceptance | 09/03/1955 | |
| UNITED KINGDOM | Signature | 23/10/1954 | |
| UNITED KINGDOM | Ratification | 05/05/1955 | |
| UNITED KINGDOM | Acceptance | 05/05/1955 | |
| UNITED STATES OF AMERICA | Signature | 23/10/1954 | |
| UNITED STATES OF AMERICA | Acceptance | 20/04/1955 | |