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In page Ruhr:
"The development of the region into an urbanized industrial area started in the late 18th century with the early industrialisation in the nearby Wupper Valley in the Bergisches Land. By around 1820, hundreds of water-powered mills were producing textiles, lumber, shingles and iron in automated processes here.[citation needed] In additional workshops in the hills, highly skilled workers manufactured knives, tools, weapons and harnesses, using water, coal and charcoal.
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