I claim the ornamental design for a teething tube, as shown and described.
FIG. 1 is a left hand side perspective view of the claimed design;
FIG. 2 is a right hand side perspective view of the claimed design of FIG. 1;
FIG. 3 is an end view from the left hand side of the claimed design of FIG. 1;
FIG. 4 is an end view from the right hand side of the claimed design of FIG. 1; and,
FIG. 5 is front view of the claimed design of FIG. 1, wherein the left, right, and back views are identical to the front view.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings form no part of the claimed design. Broken lines formed by equal length dashes show unclaimed subject matter. Broken lines formed by unequal length dashes (i.e., dash-dot) define bounds of the claimed design. Broken away symbols having a wavy element show that no particular length of the portion is claimed.