Cosmos 213 was one of a series of Soviet Soyuz programme test spacecraft whose purpose was to further test and develop the passenger version. Scientific data and measurements were relayed to earth by multichannel telemetry systems equipped with space-borne memory units. Cosmos 212 and Cosmos 213 automatically docked in orbit on April 15, 1968. Both spacecraft landed on Soviet territory.
Text comes from NASA NSSDC Master Catalog (http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1968-030A)
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Cosmos is name of a series of satellites which were launched by the Soviet Union and are being launched now by Russia.
There were six classes, labelled Cosmos A, B, C, D, E and F (a satellite of each class would be numbered independently of this).
If the engine misfired or the burn was not completed, the probes which would be left in Earth orbit would be given a Cosmos designation, which allowed the Soviets to claim a more successful record for their planetary exploration programs, and also may have helped further disguise genuine military satellites of the Cosmos series.