Thanks Corrado 
Am I correct in the Sheffield atributation? 
Also have you ever seen a similar mechanism for powder dispensing. 
I assume it was designed so that you did not have to put your thumb over the top of the spout, probably something a gentleman should not have to do to getting his thumb dirty. 
But quiet a complex solution to a simple operation. 
Regards 
Ken
		 
		
		
		
		
		
		
		
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