| http://www.w3.org/ns/prov#value | - In particular, plate-shaped pieces are incorporated to be able to function as the load propagating means 20B more markedly. [0039] In order to fulfill such function, it is preferable to use, for example, high-hardness rubber, urethane resin, plastics (for example, phenol resin reinforced by a reinforcement material) having a high mechanical strength, or metal such as aluminum, iron or the like for
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