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