| http://www.w3.org/ns/prov#value | - In one embodiment, the first and second impedance discontinuity elements are passive impedance discontinuity elements, e.g., the first and second impedance discontinuity elements can be a solid of steel, an elastomer, wood, etc., a spring, such as coil, leaf, ring, plate, etc., or the like, as long as the first and second impedance discontinuity elements are of different stiffness.
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