The ornamental design for a tablebase, as shown and described herein.
FIG. 1 is a top front perspective view of a table base of our new design, that portion shown in phantom not being part of the design sought to be patented and being provided for environmental purposes only.
FIG. 2 is a front side elevational view of the table base of our new design illustrated in FIG. 1. The rear side elevational view of the table base of our new design is a mirror image of that shown in FIG. 2.
FIG. 3 is a right side elevational view of the table base of our new design illustrated in FIG. 1. The left side elevational view of the table base of our new design is a mirror image of that shown in FIG. 3.
FIG. 4 is a top plan view of the table base of our new design illustrated in FIG. 1; and,
FIG. 5 is a bottom plan view of the table base of our new design illustrated in FIG. 1.
The dashed lines in the drawings illustrate portions of the table base that form no part of the claimed design.