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Priority claimed from NL8200950Aexternal-prioritypatent/NL8200950A/en
Application filed by Schlumberger MeterfabfiledCriticalSchlumberger Meterfab
Priority claimed from EP83200315Aexternal-prioritypatent/EP0091140B1/en
Application grantedgrantedCritical
Publication of ATE43911T1publicationCriticalpatent/ATE43911T1/en