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RD-180 (rocket engine)
The RD-180 is a dual-combustion chamber, dual nozzle, Russian-developed rocket engine which essentially is a cut-down version of a larger Russian engine with four combustion chambers, the RD-170, which is used in Zenit rockets. Rights to employ the RD-180 engine were acquired by General Dynamics (later purchased by Lockheed Martin ) in the early 1990s for use in the Evolved Expendable Launch Vehicle (EELV) and the Atlas program.
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