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Priority claimed from US06/248,947external-prioritypatent/US4415230A/en
Priority claimed from US06/249,022external-prioritypatent/US4360371A/en
Priority claimed from US06/253,224external-prioritypatent/US4395270A/en
Application filed by Corning Glass WorksfiledCriticalCorning Glass Works
Priority claimed from EP82301578Aexternal-prioritypatent/EP0061901B1/en
Application grantedgrantedCritical
Publication of ATE21773T1publicationCriticalpatent/ATE21773T1/en