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Priority claimed from US07/343,391external-prioritypatent/US4900613A/en
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Publication of FI893736A0publicationCriticalpatent/FI893736A0/fi
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Publication of FI89382BpublicationCriticalpatent/FI89382B/fi
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Publication of FI89382CpublicationCriticalpatent/FI89382C/fi