The ornamental design for an endoscope, as shown and described.
FIG. 1 is a front, top and left side perspective view of an endoscope, showing our new design;
FIG. 2 is a front, top and right side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a left side elevational view thereof;
FIG. 9 is a partial enlarged front, top and left side perspective view thereof within the dot-dash broken line box identified as 9 in FIG. 1; and,
FIG. 10 is a partial enlarged front, top and right side perspective view thereof within the dot-dash broken line box identified as 10 in FIG. 2.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.