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The ornamental design for a four button trackball, as shown and described.
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FIG. 1 is a left side plan view of a four button trackball showing the new design.
FIG. 2 is a right side plan view thereof.
FIG. 3 is a front side plan view thereof.
FIG. 4 is a back side plan view thereof; and,
FIG. 5 is a top plan view thereof.
The broken line drawing of a portion of a cord in FIGS. 1, 2, 3 and 5 is for illustrative purposes only and forms no part of the claimed design.
Von Ilberg, Stephan A., Shehan, Peter
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jul 20 1999 | Logitech Europe S.A. | (assignment on the face of the patent) | / | |||
| Aug 27 1999 | VON ILBERG, STEPHAN A | LOGITECH INC , A CORPORATION OF CALIFORNIA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 010305 | /0105 | |
| Sep 08 1999 | SHEEHAN, PETER | LOGITECH INC , A CORPORATION OF CALIFORNIA | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 010305 | /0105 | |
| Feb 08 2002 | LOGITECH, INC | LOGITECH EUROPE S A | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 012858 | /0642 |
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