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Priority claimed from US06/087,149external-prioritypatent/US4276360A/en
Priority claimed from US06/119,972external-prioritypatent/US4352977A/en
Application filed by Hardigg Ind IncfiledCriticalHardigg Ind Inc
Priority claimed from EP19800303710external-prioritypatent/EP0028116B1/de
Application grantedgrantedCritical
Publication of ATE21975T1publicationCriticalpatent/ATE21975T1/de