what type of rocket engine runs on liquid hydrogen and delivers a thrust in vacuum not exceeding 1.96e+06?
(AND spaceflight.bipropellant_rocket_engine (AND (lt spaceflight.rocket_engine.thrust_vacuum 1.96e+06^^http://www.w3.org/2001/XMLSchema#float) (JOIN (R spaceflight.rocket_engine_fuel.rocket_engines) m.0g0nz)))