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Priority claimed from US06/844,694external-prioritypatent/US4720331A/en
Priority claimed from US06/926,721external-prioritypatent/US4715938A/en
Application filed by Roger Evan BillingsfiledCriticalRoger Evan Billings
Publication of DK607487ApublicationCriticalpatent/DK607487A/da
Publication of DK607487D0publicationCriticalpatent/DK607487D0/da