| http://www.w3.org/ns/prov#value | - Corner piece 260 may alternatively be of the form of a tubular bladder containing air, gas, fluid, gel, or other material, and may either have a fixed volume and pressure or be coupled to a mechanism for altering the volume and/or pressure of the a air, gas, fluid, gel, or other material so that the firmness, compressibility, and the like properties may be adjusted to suit the particular planariza
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