Metallic load-carrying elements (3,23) are helically spun around a central member (1,21) comprising a supporting member or members (9,24) constituting a structure (4,24) which defines at least one passage (6,26) wholly accommodating at least one electrical or optical transmission element (7,27). The...http://www.google.es/patents/US4514058?utm_source=gb-gplus-sharePatente US4514058 - Transmission cable with helical support elements of curvilinear profile
Transmission cable with helical support elements of curvilinear profile
