{HEAD ~ Needle valves} are also used in {TAIL ~ situations} where the flow must be gradually brought to a halt, and at other points where precise adjustments of flow are necessary or where a small flow rate is desired for medical use 
{ HEAD ~ Needle valves } are also used in { TAIL ~ situations } where the flow must be gradually brought to a halt , and at other points where precise adjustments of flow are necessary or where a small flow rate is desired for medical use
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