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China was fourth nation to build a cryogenic rocket engine (YF-73) in 1984
Reference (slides 11 and 30): http://www.slideshare.net/pawanrm1/cryogenic-rocket-engine-45694341
Reference (slides 11 and 30): http://www.slideshare.net/pawanrm1/cryogenic-rocket-engine-45694341