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Priority claimed from US06/666,458external-prioritypatent/US4569310A/en
Priority claimed from US06/785,433external-prioritypatent/US4637792A/en
Application filed by Arkansas Patents IncfiledCriticalArkansas Patents Inc
Application grantedgrantedCritical
Publication of ATE67835T1publicationCriticalpatent/ATE67835T1/de