The ornamental design for portion of a controller for electronic gamemachine, as shown and described.
FIG. 1 is a front, top and left perspective view of a controller for electronic game machine showing a trigger button constituting a portion of the controller;
FIG. 2 is a rear, bottom and right perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof, a left side view being a mirror image thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a sectional view taken at line 8—8 of FIG. 3; and,
FIG. 9 is a reference perspective view showing a state that another controller is attached onto this controller.
The broken lines are for illustrative purpose only and form no part of the claimed design.