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COSMOS 399
Launch Details
| Launched | 2 March 1971 |
| Flight ended | 16 March 1971 |
| Status | Decayed |
| Launch site | Tyuratam Missile and Space Center, Kazakhstan (Also known as Baikonur Cosmodrome) |
| Owner | Commonwealth of Independent States (former USSR) |
| NORAD ID | 5003 |
| COSPAR ID | 1971-017A |
| Observing |