Abstract: The surface of an aluminum conductor is roughened, for example, by blasting. A hydrophilic film such as a boehmite film, an anodic oxide film and a chemical conversion film is formed on the roughened surface. A protective film made of a wetting agent or a hydrophilic resin is formed on the hydrophilic film. The conductor may comprise a compressed aluminum conductor.

Abstract: A composite overhead cable structure for electric and optical transmission comprising a pipe, at least one layer of stranded metallic elongated conductor surrounding the outer periphery of said pipe in close contact with said outer periphery, and an optical fiber cable tightly disposed within and extending throughout the length of said pipe through the medium of a packing comprised of at least one double packing layer of a non-metallic soft packing layer and a non-metallic rigid packing layer, thereby providing fixed package of said optical fiber cable in said pipe through said packing so that said optical fiber is unmovable relative to said pipe. With such a structure, the optical fiber cable is effectively prevented from not only occurrence of local bending or, but also from suffering excessive lateral forces, which leads to elimination of a danger that the optical fiber be damaged, thereby enabling the optical transmission properties to be stably maintained.