Abstract: An optical fiber-embedded PC steel strand includes a PC steel strand in which a plurality of PC steel wires are twisted together, and an optical fiber. The optical fiber is fixed with a resin in a twist groove that is a groove between two PC steel wires of the PC steel wires, the two PC steel wires being disposed at an outer surface of the PC steel strand and being next to each other. A coefficient of variation in distance between a common tangent of the two PC steel wires that form the twist groove and are next to each other, and a center of the optical fiber is 0.5 or less, as measured in 10 cross sections of the PC steel strand that are perpendicular to a longitudinal direction of the PC steel strand.

Abstract: A blind having plural rudder cords each of which is formed of a pair of vertical strings and plural lateral strings joining the vertical strings together, and each of which is brought down from a head box in the vertical direction, and plural pieces of slats extending horizontally on the lateral strings of the rudder cords, retained in parallel with one another and adapted to be turned by the operations of the rudder cords, whereby the blind is opened and closed, comprising openings provided in the portions of each of the slats which are in the vicinity of the rudder cords, and drawing strings which are capable of being pulled up, and which are brought down from the head box along the rudder cords, inserted through the openings of the slats and made connectable at lower end portions thereof to the portions of either one of the respective pairs of vertical strings of the rudder cords which are in positions of an arbitrary height.

Abstract: A blind having plural rudder cords each of which is formed of a pair of vertical strings and plural lateral strings joining the vertical strings together, and each of which is brought down from a head box in the vertical direction, and plural pieces of slats extending horizontally on the lateral strings of the rudder cords, retained in parallel with one another and adapted to be turned by the operations of the rudder cords, whereby the blind is opened and closed, comprising openings provided in the portions of each of the slats which are in the vicinity of the rudder cords, and drawing strings which are capable of being pulled up, and which are brought down from the head box along the rudder cords, inserted through the openings of the slats and made connectable at lower end portions thereof to the portions of either one of the respective pairs of vertical strings of the rudder cords which are in positions of an arbitrary height.