Model of a ladder, Peter van der Loo, c. 1850 demonstration model Model of a simple two -part work ladder. The extendable part has a wheel at the top of each leg. Two hooks on the bracket of the extendable part can be beaten to prevent the sports from the part to prevent it from moving back. The Hague wood (plant material). brass (alloy)

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Photo credit: © piemags/rmn / Alamy / Afripics
License: Licensed
Model Released: No

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