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Laying your hands on an intact engine will help you to understand its workings. It less helpful in understanding how to manufacture such an engine - you must be able to replicate mechanical tolerances, you need materials knowledge. And access to tools.


In the eighties, Toshiba got into an uncomfortable situation in the US when it sold then-state-of-the-art milling machines to the Soviet Union. These were used to produced submarine propellers much quieter than the ones produced before.


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