| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| BELGIUM | Signature | 02/04/1953 | |
| DENMARK | Signature | 02/04/1953 | |
| FRANCE | Signature | 02/04/1953 | |
| ICELAND | Signature | 02/04/1953 | |
| IRELAND, REPUBLIC OF | Signature | 02/04/1953 | |
| NETHERLANDS THE | Signature | 02/04/1953 | |
| NORWAY | Signature | 02/04/1953 | |
| POLAND | Signature | 02/04/1953 | |
| PORTUGAL | Signature | 02/04/1953 | |
| SPAIN | Signature | 02/04/1953 | |
| SWEDEN | Signature | 02/04/1953 | |
| UNITED KINGDOM | Signature | 02/04/1953 |