Machine Center

The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee. FIG. 1 is a perspective view; FIG. 2 is a front view; FIG. 3 is a rear view; FIG. 4 is a left side view; FIG. 5 is a right side view; and, FIG. 6 is a top view. The machine center of the present design is a large-sized heavy item, and the bottom view forms no part of the claimed design and is therefore omitted. The dashed lines in the drawings depict portions of the machine center and form no part of the claimed design while the solid lines in black & white and colors form part of the claimed design.