| http://www.w3.org/ns/prov#value | - The gelatinous material is preferably a thixotropic material, so that its viscosity increases as the shear rate decreases, that is that the material thickens and firms to a gelatinous form as its handling decreases. [0013]FIG. 2 shows an array of heating elements 4, e.g. a layer of deposited resistive material, disposed on the underside of the supporting, ceramic substrate 2 so as to provide heat
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