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The ornamental design for a screwdriver head, as shown and described.
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FIG. 1 is a perspective view of a screwdriver head, showing my new invention;
FIG. 2 is a front elevation view of FIG. 1;
FIG. 3 is a right side elevation view of FIG. 2;
FIG. 4 is a top plan view taken along the sectional line 7--7 of FIG. 3;
FIG. 5 is a bottom plan view of FIG. 3; and,
FIG. 6 is a bottom plan view taken along the sectional line 9--9 of FIG. 3.
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