The ornamental design for a curtaintiebackrope, as shown and described.
FIG. 1 is a reduced scale perspective view of a complete curtain tieback rope showing my new design, shown with the rope cut away to show no specific length;
FIG. 2 is a front elevation view of an enlarged single head of the curtain tieback rope shown separately for clarity of illustration;
FIG. 3 is a rear elevation view of the enlarged single head of the curtain tieback rope shown separately for clarity of illustration;
FIG. 4 is a left side elevation view of the enlarged single head of the curtain tieback rope shown separately for clarity of illustration;
FIG. 5 is a right side elevation view of the enlarged single head of the curtain tieback rope shown separately for clarity of illustration;
FIG. 6 is a top plan view of the enlarged single head of the curtain tieback rope shown separately for clarity of illustration; and,
FIG. 7 is a bottom plan view of the enlarged single head of the curtain tieback rope shown separately for clarity of illustration.
The broken away symbols in the drawings indicate that any portion of the article beyond what is shown forms no part of the claimed design.