| Contracting Parties | Signature | Ratification (Instrument deposited on) |
Entry into force |
| GERMANY | 04.09.1958 | 24.11.1961 | 24.12.1961 |
| BELGIUM | 04.09.1958 | / | / |
| FRANCE | 04.09.1958 | 24.09.1959 | 24.12.1961 |
| + LUXEMBOURG | 04.09.1958 | 16.06.1982 | 16.07.1982 |
| NETHERLANDS | 04.09.1958 | 28.03.1962 | 27.04.1962 |
| TURKEY | 04.09.1958 | 08.09.1962 | 08.10.1962 |
| + AUSTRIA | 04.09.1958 | 01.09.1965 | 01.10.1965 |
| + ITALY | 04.09.1958 | 07.11.1968 | 07.12.1968 |
| + SPAIN | 04.09.1958 | 16.12.1976 | 15.01.1977 |
| + PORTUGAL | 04.09.1958 | 04.06.1984 | 04.07.1984 |
| + accession |