{HEAD ~ The improvement} in {TAIL ~ a fluid valve} 12, wherein said PTFE male and female rings are formed of carbon filled PTFE and said V ring therebetween is formed of unfilled PTFE 
in
{ HEAD ~ The improvement } in { TAIL ~ a fluid valve } 12 , wherein said PTFE male and female rings are formed of carbon filled PTFE and said V ring therebetween is formed of unfilled PTFE
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