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The ornamental design for a ball valve, as shown and described.
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FIG. 1 is a front elevational view of a ball valve embodying the design of the present invention;
FIG. 2 is a back elevation view of the ball valve of FIG. 1;
FIG. 3 is a left-hand side elevation view of the ball valve of FIG. 1;
FIG. 4 is a right-hand side elevationaview of the ball valve of FIG. 1;
FIG. 5 is a bottom elevation view of the ball valve of FIG. 1; and,
FIG. 6 is a top elevation view of the ball valve of FIG. 1.
Knobel, Stephen, Heimgartner, Michael
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 15 2001 | KNOBEL, STEPHEN | Georg Fischer Rohrleitungssysteme AG | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011591 | /0734 | |
Feb 15 2001 | HEIMGARTNER, MICHAEL | Georg Fischer Rohrleitungssysteme AG | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011591 | /0734 | |
Mar 06 2001 | Georg Fischer Rohrleitungssysteme AG | (assignment on the face of the patent) | / |
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