| http://www.w3.org/ns/prov#value | - ing flow of gasthrough said conduit;means for maintaining general continuity of mud flow rate to said degassing means, said means including a source of gas-free mud, a conduit from said source of gas-free mud to said degassing means, and means for allowing flow of mud from saidsource of gas-free mud to said degassing means but preventing flow into said source of gas-free mud;a degassing means dril
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