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			 The ornamental design for an underwater exhaust system, as shown and described. 
			  
			  
			  
			  
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FIG. 1. Is a front view of our underwater exhaust system;
FIG. 2. Is a front perspective view of our underwater exhaust system;
FIG. 3. Is a right side view thereof with the left side view being a mirror image thereof;
FIG. 4. Is a back view thereof;
FIG. 5. Is a bottom view thereof; and,
FIG. 6. Is a top view thereof.
Morgan, William B., Morgan, Connie L., Schultz, Trent M., Ryan, Peter M.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Apr 19 2004 | MORGAN, CONNIE L | KIRBY MORGAN DIVE SYSTEMS, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015262 | /0688 | |
| Apr 20 2004 | MORGAN, WILLIAM B | KIRBY MORGAN DIVE SYSTEMS, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015262 | /0688 | |
| Apr 20 2004 | SCHULTZ, TRENT | KIRBY MORGAN DIVE SYSTEMS, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015262 | /0688 | |
| Apr 20 2004 | RYAN, PETER M | KIRBY MORGAN DIVE SYSTEMS, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015262 | /0688 | |
| Apr 22 2004 | Kirby Morgan Dive Systems, Inc. | (assignment on the face of the patent) | / | 
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