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Priority claimed from ZA837172Aexternal-prioritypatent/ZA837172B/en
Application filed by Petrus Frans Jacobus BouwerfiledCriticalPetrus Frans Jacobus Bouwer
Priority to ZA848051ApriorityCriticalpatent/ZA848051B/en
Publication of ZA848051BpublicationCriticalpatent/ZA848051B/en