What is purpose of fullers on blades?
			 
			 
			
		
		
		
			
			Probably a very simple answer to this question, but can anyone tell me why some sword/knife blades have fullers and some do not. 
Also what is the purpose of this? Various sources call these a "blood grove" but I have my doubts that this is the reason. 
Stu
		 
		
		
		
		
		
		
		
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