| http://www.w3.org/ns/prov#value | - Apparatus according to claim 1 or 2 wherein fused particles removed from the conveying means are in a form of a sheet and further comprising means for reinforcing the sheet including means for directing heated humid air to a side of the sheet which was closest to the porous surface for fusing particles of the sheet at points of contact between the surfaces of the particles while substantially avoi
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