| http://www.w3.org/ns/prov#value | - The self-gripping devices are adapted to penetrate and become loged in a receiving material or layer which can be formed from a variety of materials including woven, non-woven, and knitted fabrics and fibers, carpets and carpet'like materials, foam rubber and plastics, wood, cork, sponge, leather, paper, cardboard, corrugated carboard, metal and plastic mesh, expanded and perforated sheet material
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