prov:value
| - The material for forming the rigidity imparting member 7 is not particularly limited but may be selected from metal materials of, for example, a stainless steel, a cobalt alloy, a solder, a brazing material, and a superelastic alloy, and resin (plastic) materials of, for example, a fluorocarbon resin such as polytetrafluoroethylene, an epoxy resin, and polyimide.
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