U S Patent 6,742,909 2004 Jun; :1-8
A lighted line having an elongate flexible wire-formed bulbless light source is encased in a supportive covering, which may include a surrounding rope and tubular sheathing. An electrical power source operatively connected to the wire-formed light source is adapted to energize it to produce light, which radiates laterally of the line and emanates through the rope and tubular sheathing.
Underground-mining; Underground-miners; Miners; Illumination; Lighting; Mine-rescue; Emergency-equipment; Tunneling
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
U S Patent 6,742,909