| Patent | Priority | Assignee | Title | 
	      
	 | 2017176, |  |  |  | 
    
	 | 2041227, |  |  |  | 
    
	 | 2048122, |  |  |  | 
    
	 | 2092858, |  |  |  | 
    
	 | 2180841, |  |  |  | 
    
	 | 2328579, |  |  |  | 
    
	 | 2339156, |  |  |  | 
    
	 | 2352766, |  |  |  | 
    
	 | 2385898, |  |  |  | 
    
	 | 2416332, |  |  |  | 
    
	 | 2508962, |  |  |  | 
    
	 | 2524766, |  |  |  | 
    
	 | 2619226, |  |  |  | 
    
	 | 2750093, |  |  |  | 
    
	 | 2758775, |  |  |  | 
    
	 | 2819831, |  |  |  | 
    
	 | 2936940, |  |  |  | 
    
	 | 2970735, |  |  |  | 
    
	 | 3006257, |  |  |  | 
    
	 | 3127082, |  |  |  | 
    
	 | 3228584, |  |  |  | 
    
	 | 3259303, |  |  |  | 
    
	 | 3314591, |  |  |  | 
    
	 | 3349959, |  |  |  | 
    
	 | 3373917, |  |  |  | 
    
	 | 3380646, |  |  |  | 
    
	 | 3426499, |  |  |  | 
    
	 | 3434652, |  |  |  | 
    
	 | 3437258, |  |  |  | 
    
	 | 3462067, |  |  |  | 
    
	 | 3505779, |  |  |  | 
    
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	 | 3604491, |  |  |  | 
    
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