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Chinese iron workers smelting iron ore to make pig iron and wrought iron. This illustration is only half of the picture showing the puddling process, while the right half (not shown) displays men operating a blast furnace. This illustration is an original from the
Tiangong Kaiwu encyclopedia printed
441:{{Information |Description={{en|Chinese iron workers smelting iron ore to make pig iron and wrought iron. This illustration is only half of the picture showing the puddling process, while the right half (not shown) displays men operating a blast furnace.
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Chinese iron workers smelting iron ore to make pig iron and wrought iron. This illustration is only half of the picture showing the puddling process, while the right half (not shown) displays men operating a blast furnace. From the
Tiangong Kaiwu
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180:. The picture also appears in Figure 14-10 on page 250 of E-tu Zen Sun and Shiou-Chuan Sun's translation of the Tiangong Kaiwu encyclopedia (Pennsylvania State University Press, 1966).
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in 1637, written by the Ming
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