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to study the Sun and ionosphere. Orbit around 200-1550 km.
* 1975 June 3 -- Interkosmos 14
* 1975 September 2 -- Vertikal-3 Solar Ultraviolet/Solar X-ray mission.
* 1976 -- Re-entry Vehicle Test mission.
* 1976 June 19 -- Interkosmos 15. Testing of new systems and components of satellite under space flight conditions.
* 1977 March 29 -- Investigation of the upper atmosphere and outer space.
* 1977 June 17 -- Signe 3 - Twenty French specialists

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