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had cast iron columns and wrought iron beams. Columns at the Crystal Palace (1851), as well as short trusses, were made from the cast iron, while longer beams used wrought iron. A less-known precursor to the modern steel frame construction, the four-storey Boat Store ("Shed 78", 1858-1860), has its rigid frame constructed also from cast iron columns and wrought iron girders. With no internal walls and external walls made from sheet metal,

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