Given the task definition and input, reply with output. In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.

Context: The inner bay was defined by two close pairs of interplane struts, which between them supported the push-pull pairs of Le Rhone 9C nine cylinder rotary engines Link Information: Lawrence Hargrave first developed a rotary engine in 1889 using compressed air, intending to use it in powered flight. Question: When was the engine invented?
Answer: 1889