original question: Which manufacturer produced [Space Shuttle main engine]?
answer: rocketdyne
answer type: Rocket engine manufacturer.
auxiliary information: The Aerojet Rocketdyne RS-25, otherwise known as the Space Shuttle Main Engine, is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is planned to be used on its successor, the Space Launch System. Built in the United States by Rocketdyne, the RS-25 burns cryogenic liquid hydrogen & liquid oxygen propellants, with each engine producing 1,859 kN of thrust at liftoff. Although the RS-25 can trace its heritage back to the 1960s, concerted development of the engine began in the 1970s, with the first flight, STS-1, occurring on April 12, 1981. The RS-25 has undergone several upgrades over its operational history to improve the engine's reliability, safety and maintenance load. The engine produces a specific impulse of 452 seconds in a vacuum, or 366 seconds at sea level, has a mass of approximately 3.5 tonnes, and is capable of throttling between 67% and 109% of its rated power level in one-percent increments. The RS-25 operates under temperatures ranging from ‚àí253 ¬∞C to 3,315 ¬∞C. On the Space Shuttle, the RS-25 was used in clusters of three engines mounted in the aft structure of the Orbiter, with fuel being drawn from the external tank.
The [Space Shuttle main engine] was produced by which manufacturer?