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MICROSAT 4
Launch Details
| Launched | 16 July 1991 |
| Flight ended | 22 January 1992 |
| Status | Decayed |
| Launch site | Air Force Western Test Range, California, USA |
| Owner | United States |
| NORAD ID | 21583 |
| COSPAR ID | 1991-051D |
| Observing |