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Dispositivo utilizzabile in particolare per il pompaggio di un fluido molto viscoso e/o contenente una proporzione considerevole di gas, particolarmente per la produzione di petrolio
Fremgangsmaate for aa bestemme sammenskruingsmomentet for en roerkobling med koniske gjenger og et anslag for begrensning av sammenskruingen, for bruk i oljeindustrien, og en anordning for utfoerelse av fremgangsmaaten.