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staircase model Double-revolution stairway model
From the collection of Cooper Hewitt, Smithsonian Design Museum. Free to download, adapt and use — no permission needed.
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Cooper Hewitt, Smithsonian Design Museum’s own descriptionCredit linestaircase model Double-revolution stairway model. 1850–1900. R. B.. Cooper Hewitt, Smithsonian Design Museum, Gift of Eugene V. and Clare E. Thaw. CC0.