Blok 2BL

The Blok 2BL was a rocket stage, a member of Blok L family, used as an upper stage on some versions of the Molniya-M carrier rocket. It was used as a fourth stage to launch the Oko missile early warning defence spacecraft.[1]

References
  1. "US-K (73D6)". Gunther's Space Page. 2012-03-08. Retrieved 2012-04-21.
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