| http://www.w3.org/ns/prov#value | - An object of the present invention is to provide a composition board having its opposite edges corner beveled in a manner to provide longitudinal depressions between contiguous boards, when secured to a support and abuttingly engaged, so that when plaster or other coating material is applied to the surfaces of the boards, such material will be thicker in the region of the joint, thus increasing it
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