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Sistema Stykovki i Vnutrennego Perekhoda, SSVP is a docking standard used by Soviet and Russian spacecraft, sometimes called RDS for Russian Docking System. It has been used on all variants of Soyuz other than the Soyuz 7K-L3 and early flights of the Soyuz 7K-OK, as well as Progress, TKS, ATV, and on all Soviet and Russian space stations.
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