Workers move the so-called bucket dredger machine by moving their arms and legs on stair boards. A small model was built of the machine, but whether it was actually executed is unknown. d'Arles de Linière, 6 April 1761 National Archive, Archive Staten van Holland, , 5675 The National Archive presents in collaboration with the Technical University of Delft and Kunsthal Rotterdam a versatile family exhibition about Dutch inventions and innovations at the Kunsthal Rotterdam. December 19, 2009 until March 21, 2010;

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