Generator

FIG. 1 is a perspective view of the claimed design for a generator;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof.

The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the figures illustrate portions of the generator that form no part of the claimed design.