The ornamental design for a lampbase, as shown and described.
FIG. is a perspective view of the lamp base comprising my new design, the
the lamp base being symmetric about its vertical axis;
FIG. 2 is an elevational view of my lamp base design;
FIG. 3 is a top plan view of my lamp base design; and,
FIG. 4 is a perspective view of an alternative embodiment of my lamp base
design as claimed the only difference being the translucent appearance of
the surface.
The broken lines shown in FIGS. 1, 2 and 4 are for illustrative purposes
only and form no part of the claimed design.