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			 The ornamental design for a smoke detector, as shown and described.  | 
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FIG. 1 is a top plan view of a smoke detector showing my new design;
FIG. 2 is a side elevational view of the smoke detector;
FIG. 3 is a bottom view of the smoke detector;
FIG. 4 is a top plan view of a second embodiment of the smoke detector;
FIG. 5 is a side elevational view of the second embodiment of the smoke detector; and
FIG. 6 is a bottom view of the second embodiment of the smoke detector.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Mar 19 1981 | FENNE KENNETH R | PITTWAY CORPORATION, A CORP OF PA | ASSIGNMENT OF ASSIGNORS INTEREST | 003874 | /0797 | |
| Mar 25 1981 | Pittway Corporation | (assignment on the face of the patent) | / | 
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