Didn't Boeing provide China with equipment and technology for manufacturing large, i.e 747 size, airframes a bunch of years ago? Dave:

https://en.wikipedia.org/wiki/Focke-Wulf_Fw_61 The Focke-Wulf Fw 61 is often considered the first practical, functional helicopter, first flown in 1936. It was also known as the Fa 61, as Focke began a new company—Focke-Achgelis—after development had begun. Professor Henrich Focke, through his...

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