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Priority claimed from US07/229,130external-prioritypatent/US4884963A/en
Priority claimed from US07/383,671external-prioritypatent/US4926798A/en
Application filed by Gas Res InstfiledCriticalGas Res Inst
Application grantedgrantedCritical
Publication of ATE90437T1publicationCriticalpatent/ATE90437T1/en