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The ornamental design for a apparatus for honing piezo-electric crystals, as shown and described. |
FIG. 1 is a view in front elevation of my new apparatus for honing piezo-electric crystals, showing my new design;
FIG. 2 is a view of one side thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a view of the other side thereof; and
FIG. 6 is a bottom plan view thereof.
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