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The ornamental design for a pump valve piston, as shown and described.
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FIG. 1 is a perspective view of my pump valve piston;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a sectional view taken generally along sectional lines 8—8 of FIG. 4; and,
FIG. 9 is a section view taken generally along sectional lines 9—9 of FIG. 4.
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Jan 08 2004 | FREITAS, MICHAEL W | DISPENSER SERVICES OF TEXAS, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 014889 | /0879 | |
Jan 13 2004 | Dispenser Services of Texas, Inc. | (assignment on the face of the patent) | / |
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