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Priority claimed from GB609974Aexternal-prioritypatent/GB1454050A/en
Application filed by Spiroll Corp LtdfiledCriticalSpiroll Corp Ltd
Priority to CA313,253ApriorityCriticalpatent/CA1091905A/fr
Application grantedgrantedCritical
Publication of CA1091905ApublicationCriticalpatent/CA1091905A/fr