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Priority to JP1985075407UpriorityCriticalpatent/JPH058454Y2/ja
Priority to CA000493573Aprioritypatent/CA1240165A/en
Priority to US06/790,268prioritypatent/US4648247A/en
Publication of JPS61195281UpublicationCriticalpatent/JPS61195281U/ja
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Publication of JPH058454Y2publicationCriticalpatent/JPH058454Y2/ja