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The ornamental design for an exterior wiper head for drill pipe, as shown and described. |
FIG. 1 is a top and front perspective view of an exterior wiper head for drill pipe showing our new design;
FIG. 2 is a bottom and rear perspective view;
FIG. 3 is a side elevational view;
FIG. 4 is another side elevational view;
FIG. 5 is a rear elevational view;
FIG. 6 is a front elevational view;
FIG. 7 is a top plan view; and,
FIG. 8 is a bottom plan view thereof.
FIGS. 1 and 2 have been drawn on an enlarged scale with respect to FIGS. 3-8.
Mason, Ronald J., Mason, Steven B.
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