|   
		 
			 We claim the ornamental design for an open vessel sealer with mechanical cutter, as shown. 
			  
			 | 
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FIG. 1 is a perspective view of an open vessel sealer with mechanical cutter showing our new design;
FIG. 2 is a right side view of the open vessel sealer with mechanical cutter;
FIG. 3 is a left side view of the open vessel sealer with mechanical cutter;
FIG. 4 is a bottom view of the open vessel sealer with mechanical cutter;
FIG. 5 is a top view of the open vessel sealer with mechanical cutter;
FIG. 6 is a front view of the open vessel sealer with mechanical cutter; and,
FIG. 7 is a rear view of the open vessel sealer with mechanical cutter.
Kerr, Duane E., Moses, Michael C., Romero, Paul R.
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