References Wang Zhen (inventor)

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sources

needham, joseph (1986). science , civilization in china: volume 4, part 2. taipei: caves books, ltd.
needham, joseph (1986). science , civilization in china: volume 5, part 1. taipei: caves books, ltd.
needham, joseph (1986). science , civilization in china: volume 6, part 2. taipei: caves books, ltd.






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