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Priority claimed from US07/155,772external-prioritypatent/US4811811A/en
Priority claimed from US07/257,574external-prioritypatent/US4878559A/en
Application filed by Deere & CofiledCriticalDeere & Co
Application grantedgrantedCritical
Publication of ATE90628T1publicationCriticalpatent/ATE90628T1/de