| http://www.w3.org/ns/prov#value | - The upper or outer faces of the sides of the outer member or shell l are coated with sand or other substance for providing a rough surface, and the upper or inner faces of the sides of the inner'member 6 are similarly treated while the flanges Stand lower faces. of the sides of the inner and outer members are left smooth. ' From the foregoing taken in connection with 'the drawing, it will be evide
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