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Model of a Ladder
Petrus van der Loo, c. 1850, demonstration model, NG-MC-78
Model Indicating the Headroom of…
Petrus van der Loo, c. 1860, demonstration model, NG-MC-1030
Petrus van der Loo, c. 1850, demonstration model, NG-MC-78
Petrus van der Loo, c. 1860, demonstration model, NG-MC-1030