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The ornamental design for a portable oil well walking beam pump jack, substantially as shown and described. |
FIG. 1 is a right side elevational view of the portable oil well walking beam pump jack which incorporates my new design, disposed in a folded position;
FIG. 2 is a right side elevational view thereof which incorporates my new design, disposed in a raised position;
FIG. 3 is a left side elevational view thereof illustrated in FIG. 2;
FIG. 4 is a rear elevational view thereof illustrated in FIG. 2;
FIG. 5 is a front elevational view thereof illustrated in FIG. 2;
FIG. 6 is a top plan view thereof shown in FIG. 2; and
FIG. 7 is a bottom plan view thereof illustrated in FIG. 2.
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