| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Signature | 11/04/1953 | |
| AUSTRIA | Ratification | 12/04/1955 | |
| BELGIUM | Signature | 11/04/1953 | |
| BELGIUM | Ratification | 29/04/1955 | |
| BULGARIA | Signature | 11/04/1953 | |
| BULGARIA | Ratification | 25/02/1955 | |
| CZECHOSLOVAKIA | Signature | 11/04/1953 | |
| CZECHOSLOVAKIA | Ratification | 30/07/1954 | |
| DENMARK | Signature | 11/04/1953 | |
| DENMARK | Ratification | 16/09/1954 | |
| FINLAND | Signature | 11/04/1953 | |
| FRANCE | Signature | 11/04/1953 | |
| FRANCE | Ratification | 04/03/1955 | |
| GREECE | Signature | 15/05/1953 | |
| HUNGARY | Signature | 11/04/1953 | |
| ITALY | Signature | 11/04/1953 | |
| LEBANON | Signature | 18/05/1953 | |
| LIECHTENSTEIN | Signature | 11/04/1953 | |
| LUXEMBOURG | Signature | 11/04/1953 | |
| LUXEMBOURG | Ratification | 12/01/1955 | |
| NETHERLANDS THE | Signature | 11/04/1953 | |
| NETHERLANDS THE | Ratification | 08/11/1954 | |
| NORWAY | Signature | 11/04/1953 | |
| NORWAY | Ratification | 13/01/1955 | |
| POLAND | Signature | 11/04/1953 | |
| PORTUGAL | Signature | 30/05/1953 | |
| ROMANIA | Signature | 11/04/1953 | |
| ROMANIA | Ratification | 24/11/1954 | |
| SAAR TERRITORY | Accession | 17/01/1956 | |
| SPAIN | Signature | 05/05/1953 | |
| SPAIN | Ratification | 28/10/1954 | |
| SWEDEN | Signature | 11/04/1953 | |
| SWEDEN | Ratification | 15/01/1955 | |
| SWITZERLAND | Signature | 11/04/1953 | |
| SWITZERLAND | Ratification | 21/04/1954 | |
| TURKEY | Signature | 01/06/1953 | |
| UNITED KINGDOM | Signature | 11/04/1953 | |
| UNITED KINGDOM | Ratification | 15/06/1954 | |
| YUGOSLAVIA | Signature | 11/04/1953 | |