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Priority claimed from US06/856,595external-prioritypatent/US4673766A/en
Priority claimed from US06/942,491external-prioritypatent/US4766249A/en
Application filed by Fries & Fries IncfiledCriticalFries & Fries Inc
Application grantedgrantedCritical
Publication of ATE89544T1publicationCriticalpatent/ATE89544T1/de