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Priority claimed from JP14535980Aexternal-prioritypatent/JPS5768437A/en
Priority claimed from JP55145358Aexternal-prioritypatent/JPS5770175A/en
Application filed by Hayakawa RubberfiledCriticalHayakawa Rubber
Priority claimed from EP81300341Aexternal-prioritypatent/EP0050906B1/en
Application grantedgrantedCritical
Publication of ATE13196T1publicationCriticalpatent/ATE13196T1/en