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Application filed by D FriedmanfiledCriticalD Friedman
Priority to ZA762758ApriorityCriticalpatent/ZA762758B/en
Priority to US05/787,297prioritypatent/US4177829A/en
Priority to GB1562677Aprioritypatent/GB1535887A/en
Publication of ZA762758BpublicationCriticalpatent/ZA762758B/en