| http://www.w3.org/ns/prov#value | - al such as aluminum or the like and to be brought into contact with the useless end portion 5 a of the sheet-shaped material 5, on the one hand, and with the upper layer 12 b, which is formed of material having an excellent cushioning property such as neoprene in the form of sponge or the like to support the above-mentioned metallic plate on the upper base member 15, on the other hand. [0035] The
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