Further speculation ...
			 
			 
			
		
		
		
			
			But if we look at blades #30 and #31 in the chart, the refference to the second one only appears to raise the price, for cutting through a blade identical to that in #30. Could in this case the term CUTT mean blade piercing ? And the double TT only due to the chart writer poor spelling ... as seen in other terms in the said chart ...
		 
		
		
		
		
		
		
		
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