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Spacecraft information: TETR 4
Launch Details
| Launched | 28 September 1971 |
| Flight ended | 18 September 1978 |
| Status | Decayed |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 5492 |
| COSPAR ID | 1971-083B |
| Observing |