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						 Patent  
						   D257770  
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						 Priority  
						Sep 22 1978 
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						 Filed 
						Sep 22 1978  
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						 Issued 
						Jan 06 1981 
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						 Expiry 
						Jan 06 1995 
					   
					   						
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						 Assg.orig 
						
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						 Entity 
						unknown 
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			  The ornamental design for a double viewer cartridge, substantially as shown and described.  
			  
			  
			  
			  
			 
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FIG. 1 is a front, top, and right side perspective view of a double viewer
cartridge showing my new design;
FIG. 2 is a front elevational view thereof, the rear view being identical
to the side shown;
FIG. 3 is a right side view thereof, the left side view being identical to
the side shown;
FIG. 4 is a top view thereof; and
FIG. 5 is a bottom view thereof.
	
	Loofbourow, Donald I.
	
	
	
	
	
	
	
	
	  
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