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			   The ornamental design for an oral irrigator, as shown and described.     
    
    
    
    
    
    
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FIG. 1 is a perspective front elevational view of an oral irrigator from above, showing my design;
FIG. 2 is a front view of the appliance;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is a side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective front elevational view with the cover in an open position.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Sep 01 1999 | HARTWEIN, PETER | Braun GmbH | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 010237 | /0199 | |
| Sep 09 1999 | Braun GmbH | (assignment on the face of the patent) | / | 
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