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Priority claimed from US429057Aexternal-prioritypatent/US3879819A/en
Priority claimed from US429058Aexternal-prioritypatent/US3887971A/en
Application filed by Chevron ResfiledCriticalChevron Res
Publication of ATA637077ApublicationCriticalpatent/ATA637077A/de
Application grantedgrantedCritical
Publication of AT372120BpublicationCriticalpatent/AT372120B/de