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Priority claimed from US06/881,904external-prioritypatent/US4741250A/en
Priority claimed from US06/931,223external-prioritypatent/US4846007A/en
Priority claimed from US07/006,007external-prioritypatent/US4838103A/en
Application filed by Paul P WeyerfiledCriticalPaul P Weyer
Application grantedgrantedCritical
Publication of ATE73906T1publicationCriticalpatent/ATE73906T1/en