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The ornamental design for a clamp for polish rod liner of an oil well pumping unit, as shown and described. |
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FIG. 1 is a bottom plan view of a clamp for polish rod liner of an oil well pumping unit showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a side elevational view taken from the right of FIG. 1;
FIG. 4 is a side elevational view taken from the left of FIG. 1;
FIG. 5 is a rear elevational view thereof; and
FIG. 6 is a front elevational view thereof.
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