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Model of a Crane for Stepping Masts
's Lands Werf Hellevoetsluis (possibly), Rijkswerf Hellevoetsluis (possibly), c. 1790 - c. 1820, demonstration model, NG-MC-34
Model of a Masting Sheer
Rijkswerf Hellevoetsluis (possibly), c. 1818, demonstration model, NG-MC-36