|   
		 
			 The ornamental design for an air heater, as shown.  | 
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FIG. 1 is a perspective view of an air heater showing my new design;
FIG. 2 is a front elevation view thereof on a reduced scale;
FIG. 3 is a rear elevation view thereof on a reduced scale;
FIG. 4 is a left side elevation view thereof on a reduced scale;
FIG. 5 is a right side elevation view thereof on a reduced scale;
FIG. 6 is a top plan view thereof on a reduced scale; and
FIG. 7 is a bottom plan view thereof on a reduced scale.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Sep 02 1988 | FAN, JACK | SYNLIX ELECTRICAL LTD , NO 7, LANE 61, NAN TSUEN ROAD, DUEN NAN TSUEN, HOU LI SHIANG | ASSIGNMENT OF ASSIGNORS INTEREST | 004951 | /0039 | |
| Sep 28 1988 | Synlix Electrical Ltd | (assignment on the face of the patent) | / | 
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