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Priority claimed from US06/151,998external-prioritypatent/US4288415A/en
Priority claimed from FI802511Aexternal-prioritypatent/FI70563C/fi
Application filed by Nl Industries IncfiledCriticalNl Industries Inc
Publication of FI831931A0publicationCriticalpatent/FI831931A0/fi
Publication of FI831931LpublicationCriticalpatent/FI831931L/fi
Publication of FI70562BpublicationCriticalpatent/FI70562B/fi
Application grantedgrantedCritical
Publication of FI70562CpublicationCriticalpatent/FI70562C/fi