[Class : 1] Chemicals In Powder Form For The Production Of Direct Pour Metal Casting Molds Using Rapid Prototyping Systems, Comprising Of A Computer Controlled Apparatus, Based On Ink Jet Technology, For The Production Of Three Dimensional Models; Chemicals In Liquid Form Used As A Binding Agent In The Manufacture Of Three Dimensional Models; Chemicals In Powder Form Used In The Manufacture Of Three Dimensional Models; Chemical Preparations In Liquid Form For Use As A Binding Agent In The Manufacture Of Molds Used To Produce Three Dimensional Models, And Chemical Preparations In Powder Form For Use As A Binding Agent In The Manufacture Of Molds Which Are Used To Produce Three Dimensional Models