With its iron frame, the flax mill is considered as the direct forerunner to the skyscraper and project officer Fay Bailey said it was of "international significance".

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The mill was built around an iron frame in a technique adapted in the rebuilding of Chicago in the late 19th Century and for skyscrapers such as New York's Empire State Building.

BBC: Ditherington Flax Mill site designs viewed

Built in 1797, the Ditherington Flax Mill was the world's first iron-framed building and has been derelict for more than 20 years.

BBC: Ditherington Flax Mill site designs viewed

The Grade-I listed Ditherington Flax Mill was the world's first iron-framed building and is considered one of the most important on the English Heritage At Risk register.

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The model begins with an input-output table, which says that, for example, the steel mill industry uses the output of the iron ore industry, the electric utility industry, as well as labor and some lesser inputs.

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Ditherington Flax Mill, built in 1797, is the world's first iron-framed building and regarded as the forerunner to the skyscraper.

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English Heritage said the Grade I-listed Ditherington Flax Mill in Shrewsbury, built in 1797, was the world's first iron-framed building.

BBC: Ditherington Flax Mill in lottery funding bid

An even lower-cost group of domestic producers are the mini-mill operators, such as Nucor, which make steel from scrap metal instead of iron ore.

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