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Priority claimed from US07/077,754external-prioritypatent/US4785850A/en
Application filed by Swirlon Ind IncfiledCriticalSwirlon Ind Inc
Priority claimed from EP87307214Aexternal-prioritypatent/EP0261784B1/de
Application grantedgrantedCritical
Publication of ATE67543T1publicationCriticalpatent/ATE67543T1/de