As early as 1936, R. Handl worked on a skate with movable chopping plate. However, it will take until 1996 before such a system under the name 'clap skat' revolutionizes skating. R. Handl, 23 October 1936 National Archives, Archive Bureau for Industrial Property (Patent files), , 3265, patent r. 39252 Made in Holland The National Archive presents in collaboration with the Technical University of Delft and Kunsthal Rotterdam a versatile family exhibition on Dutch inventions and innovations at the Kunsthal Rotterdam. December 19, 2009 until March 21, 2010;

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