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			 The ornamental design for a passive sensor, as shown and described.  | 
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FIG. 1 is a perspective view of a passive sensor showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof, the left side view being symmetrical to the right side view;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear view thereof; and,
FIG. 6 is a bottom plan view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Apr 01 1999 | Nippon Aleph Corporation | (assignment on the face of the patent) | / | |||
| Apr 20 1999 | KANZAKI, HITOSHI | Nippon Aleph Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 010127 | /0505 | 
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