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.
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This article is an automated import of the Wikipedia article "Blok 2BL", available at https://en.wikipedia.org/wiki/Blok_2BL . Text is licensed under CC BY-SA 4.0.