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			 The ornamental design for a stool, as shown and described. 
			  
			  
			  
			  
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The broken lines shown represent environmental subject matter and form no part of the claimed design.
| Patent | Priority | Assignee | Title | 
| 1374716, | |||
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| 233108, | |||
| 234476, | |||
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| D399066, | Jun 02 1997 | Stool | |
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| D579676, | May 31 2007 | Steelcase Development Corporation | Stool | 
| D592870, | Jul 02 2008 | Eredu, S. Coop. | Stool | 
| D611737, | Aug 17 2009 | ITOKI CORPORATION | Side table | 
| D664779, | Mar 15 2010 | VS VEREINIGTE SPEZIALMOEBELFABRIKEN GMBH & CO KG | Stool | 
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc | 
| Jun 29 2007 | KNOLL, INC | BANK OF AMERICA, N A , AS ADMINISTRATIVE AGENT | NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS | 032961 | /0004 | |
| Mar 25 2014 | Knoll, Inc. | (assignment on the face of the patent) | / | |||
| Oct 08 2014 | BARBER, EDWARD | KNOLL, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033928 | /0748 | |
| Oct 08 2014 | OSGERBY, JAY | KNOLL, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033928 | /0748 | |
| Jul 19 2021 | KNOLL, INC | GOLDMAN SACHS BANK USA, AS COLLATERAL AGENT | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 057649 | /0828 | 
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