| Contracting Parties | Signature | Ratification (Instrument deposited on) |
Entry into force |
| GERMANY | 13.09.1973 | 17.01.1977 | 16.02.1977 |
| AUSTRIA | 13.09.1973 | 16.05.1980 | 15.06.1980 |
| BELGIUM | 13.09.1973 | / | / |
| + GREECE | 13.09.1973 | 19.03.1987 | 18.04.1987 |
| + ITALY | 13.09.1973 | 06.07.1981 | 05.08.1981 |
| LUXEMBOURG | 13.09.1973 | 29.03.1982 | 28.04.1982 |
| NETHERLANDS | 13.09.1973 | 01.07.1977 | 31.07.1977 |
| TURKEY | 13.09.1973 | 09.02.1976 | 16.02.1977 |
| + accession |