The ornamental design for a operationportion of an endoscope, as shown and described.
FIG. 1 is a front, top and left side perspective view of a operation portion of an endoscope, showing our new design;
FIG. 2 is a rear, 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 left side elevational view thereof;
FIG. 8 is a right side elevational view thereof; and,
FIG. 9 is an enlarged cross-section view thereof, taken along the line 9-9 in FIG. 3.
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.