| http://www.w3.org/ns/prov#value | - The botttom 314 conveniently is made of relatively hard rubber and is cemented or otherwise secured to an inner flat base 316 fabricated of a rigid material, such as hard wood or a thin rectangular sheet of metal; the pad 311 including an upper section 317 of sponge rubber defining the exterior concave surface 312, together with a suitable covering of a rubber composition material, and a rectangul
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