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Priority claimed from GB526860Aexternal-prioritypatent/GB947493A/en
Priority claimed from FR852690Aexternal-prioritypatent/FR1282826A/fr
Application filed by Dorr Oliver IncfiledCriticalDorr Oliver Inc
Application grantedgrantedCritical
Publication of BE619534QpublicationCriticalpatent/BE619534Q/fr