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					| Patent    D908912 |  
					| Priority Apr 03 2018 |  
					| Filed Oct 01 2018 |  
					| Issued Jan 26 2021 |  
					| Expiry Jan 26 2036 |  
					|  |  
					| Assg.orig |  
					|  |  
					| Entity unknown |  
					 | 2 |  
					 | 16 |  
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			  The ornamental design for a four channel pipetting arm, as shown and described. | 
 
	
FIG. 1 is a front, bottom, left perspective view of a four channel pipetting arm showing our design therefor;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a rear, top, left perspective view thereof.
The broken lines in the drawings depict portions of the four channel pipetting arm and form no part of the claimed design.
	
	Kuster, Martin, Volkart, Roger
	
	
	
	
	  
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