The ornamental design for a grinder/polisher, as shown and described.
FIG. 1 is a front, top, right hand side perspective view of a grinder/polisher embodying the principles of my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a side view thereof as seen from the left hand side of FIG. 3;
FIG. 5 is a side view thereof as seen from the right hand side of FIG. 3; and,
FIG. 6 is a rear view thereof.
The grinder-polisher being shown with rear panel components in FIG. 6, a specimen holder in FIGS. 1–6, and control panel icons in FIGS. 1–3 all shown in phantom lines and forming no part of the claimed design.