Assertion: spacecraft's engine | /r/CapableOf | use nitrogen tetroxide
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text: Valentin Glushko, who then held a near-monopoly on rocket engine design in the Soviet Union, proposed the RD-270 engine using unsymmetrical dimethylhydrazine (UDMH) and nitrogen tetroxide (N 2 O 4 ) propellants to power the newly enlarged N1 design.