| http://www.w3.org/ns/prov#value | - Reinforcing plate 4 may be formed of a material from the group consisting of a light metal such as aluminum or aluminum alloy, a material which has strong tensile strengh such as glass fiber including copper wire, or a high molecular density compound which has high shrinkage ratio such as phenolic resin, polybutadiene, or polyamide, or the like.
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