| 摘要 |
For a cable to be laid inside a duct, the invention teaches the addition of "scales", projections, or roughening outwardly from the cable sheath to help a cable-laying procedure wherein the cable is carried through the duct, from all along its own length, by blown air emitted from behind. Substantial improvements in laying efficiency over existing blown air techniques, with less strain on the cable than if pulled by a winch, and reduced laying costs are claimed. Hence cables may be of lighter construction than that required for conventional laying procedures.
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