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Model of a Time Signal
Petrus van der Loo, 1849
Model of the Spiral Staircase of a…
Petrus van der Loo, 1834
Model Indicating the Headroom of…
Petrus van der Loo, c. 1860
Model of a Ladder
Petrus van der Loo, c. 1850
Model of a Ladder
Petrus van der Loo, c. 1850
Model of a Fire Ladder
Petrus van der Loo, c. 1850