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Priority claimed from US06/315,452external-prioritypatent/US4376806A/en
Priority claimed from US06/415,502external-prioritypatent/US4426423A/en
Application filed by Advanced Tech IncfiledCriticalAdvanced Tech Inc
Application grantedgrantedCritical
Publication of ATE18897T1publicationCriticalpatent/ATE18897T1/de