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<http://webisa.webdatacommons.org/284673919>	<http://www.w3.org/ns/prov#value>	"lumen or cylindrical envelope of the helically wound metal ribbon 48 for stiffening the lead 12 when it is inserted into a body, such as into a vein, and/or for positioning the electrode assembly 16 in the ventricle or atrium." .