| http://www.w3.org/ns/prov#value | - For example, the distal head 104 may be molded of plastic, such as acrylonitrile-butadiene-styrene (ABS) and one or more metallic foil strips or other radiopaque markers may be affixed to such plastic distal head 104 in order to impart sufficient radiodensity to permit the distal head 104 to be readily located by radiographic means.
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