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				What is the advantage/s of worm and worm wheel?    			        
	    		         Replies (0),   Started: 05-13-2015,   Last Reply: 05-13-2015 - No Replies 
			        
			         
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				How are the efficiencies of spur gear and helical gear compared?    			        
	    		         Replies (0),   Started: 05-13-2015,   Last Reply: 05-13-2015 - No Replies 
			        
			         
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