| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| AUSTRALIA | Signature | 05/03/1956 | |
| CANADA | Signature | 05/03/1956 | |
| FRANCE | Signature | 05/03/1956 | |
| GERMANY FEDERAL REPUBLIC | Signature | 05/03/1956 | |
| INDIA | Signature | 05/03/1956 | |
| NEW ZEALAND | Signature | 05/03/1956 | |
| PAKISTAN | Signature | 05/03/1956 | |
| SOUTH AFRICA | Signature | 05/03/1956 | |
| UNITED KINGDOM | Signature | 05/03/1956 |