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Model of a Time Signal
Petrus van der Loo, 1849, demonstration model, NG-MC-826
Model of the Spiral Staircase of a…
Petrus van der Loo, 1834, demonstration model, NG-MC-830
Model of a Lifting Screw
Petrus van der Loo, 1857, demonstration model, NG-MC-564-1
Model Indicating the Headroom of…
Petrus van der Loo, c. 1860, demonstration model, NG-MC-1030
Model of a Ladder
Petrus van der Loo, c. 1850, demonstration model, NG-MC-81
Model of a Ladder
Petrus van der Loo, c. 1850, demonstration model, NG-MC-76
Model of a Fire Ladder
Petrus van der Loo, c. 1850, demonstration model, NG-MC-80