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Priority claimed from US06/151,999external-prioritypatent/US4288416A/en
Priority claimed from FI802512Aexternal-prioritypatent/FI70564C/en
Application filed by Nl Industries IncfiledCriticalNl Industries Inc
Publication of FI830574A0publicationCriticalpatent/FI830574A0/en
Publication of FI830574LpublicationCriticalpatent/FI830574L/en
Publication of FI71544BpublicationCriticalpatent/FI71544B/en
Application grantedgrantedCritical
Publication of FI71544CpublicationCriticalpatent/FI71544C/en