| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRIA | Signature | 01/08/1975 | |
| BELGIUM | Signature | 01/08/1975 | |
| BULGARIA | Signature | 01/08/1975 | |
| CANADA | Signature | 01/08/1975 | |
| CYPRUS | Signature | 01/08/1975 | |
| CZECHOSLOVAKIA | Signature | 01/08/1975 | |
| DENMARK | Signature | 01/08/1975 | |
| FINLAND | Signature | 01/08/1975 | |
| FRANCE | Signature | 01/08/1975 | |
| GERMAN DEMOCRATIC REPUBLIC | Signature | 01/08/1975 | |
| GERMANY FEDERAL REPUBLIC | Signature | 01/08/1975 | |
| GREECE | Signature | 01/08/1975 | |
| HOLY SEE | Signature | 01/08/1975 | |
| HUNGARY | Signature | 01/08/1975 | |
| ICELAND | Signature | 01/08/1975 | |
| IRELAND, REPUBLIC OF | Signature | 01/08/1975 | |
| ITALY | Signature | 01/08/1975 | |
| LIECHTENSTEIN | Signature | 01/08/1975 | |
| LUXEMBOURG | Signature | 01/08/1975 | |
| MALTA | Signature | 01/08/1975 | |
| MONACO | Signature | 01/08/1975 | |
| NETHERLANDS THE | Signature | 01/08/1975 | |
| NORWAY | Signature | 01/08/1975 | |
| POLAND | Signature | 01/08/1975 | |
| PORTUGAL | Signature | 01/08/1975 | |
| ROMANIA | Signature | 01/08/1975 | |
| SAN MARINO | Signature | 01/08/1975 | |
| SOVIET UNION | Signature | 01/08/1975 | |
| SPAIN | Signature | 01/08/1975 | |
| SWEDEN | Signature | 01/08/1975 | |
| SWITZERLAND | Signature | 01/08/1975 | |
| TURKEY | Signature | 01/08/1975 | |
| UNITED KINGDOM | Signature | 01/08/1975 | |
| UNITED STATES OF AMERICA | Signature | 01/08/1975 | |
| YUGOSLAVIA | Signature | 01/08/1975 |