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Priority to JP1985131842UpriorityCriticalpatent/JPH0411679Y2/ja
Priority to US06/850,451prioritypatent/US4646451A/en
Priority to CA000506570Aprioritypatent/CA1253429A/en
Publication of JPS6239698UpublicationCriticalpatent/JPS6239698U/ja
Application grantedgrantedCritical
Publication of JPH0411679Y2publicationCriticalpatent/JPH0411679Y2/ja