Blok 2BL explained

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.

References

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Notes and References

1. Web site: US-K (73D6). Gunther's Space Page. 2012-03-08. 2012-04-21.